Truly there is a God, although the fool has said in his heart, There is no God.
AND so, Lord, do you, who do give understanding to faith, give me, so far as you knowest it to be profitable, to understand that you are as we believe; and that you are that which we believe. And indeed, we believe that you are a being than which nothing greater can be conceived. Or is there no such nature, since the fool has said in his heart, there is no God? (Psalms xiv. 1). But, at any rate, this very fool, when he hears of this being of which I speak —a being than which nothing greater can be conceived —understands what be hears, and what he understands is in his understanding; although he does not understand it to exist.
For, it is one thing for an object to be in the understanding, and another to understand that the object exists. When a painter first conceives of what he will afterwards perform, he has it in his understanding, but be does not yet understand it to be, because he has not yet performed it. But after he has made the painting, be both has it in his understanding, and he understands that it exists, because he has made it.
Hence, even the fool is convinced that something exists in the understanding, at least, than which nothing greater can be conceived. For, when he hears of this, he understands it. And whatever is understood, exists in the understanding. And assuredly that, than which nothing greater can be conceived, cannot exist in the understanding alone. For, suppose it exists in the understanding alone: then it can be conceived to exist in reality; which is greater.
Therefore, if that, than which nothing greater can be conceived, exists in the understanding alone, the very being, than which nothing greater can be conceived, is one, than which a greater can be conceived. But obviously this is impossible. Hence, there is doubt that there exists a being, than which nothing greater can be conceived, and it exists both in the understanding and in reality.
God cannot be conceived not to exist. —God is that, than which nothing greater can be conceived. —That which can be conceived not to exist is not God.
AND it assuredly exists so truly, that it cannot be conceived not to exist. For, it is possible to conceive of a being which cannot be conceived not to exist; and this is greater than one which can be conceived not to exist. Hence, if that, than which nothing greater can be conceived, can be conceived not to exist, it is not that, than which nothing greater can be conceived. But this is an irreconcilable contradiction. There is, then, so truly a being than which nothing greater can be conceived to exist, that it cannot even be conceived not to exist;. and this being you are, O Lord, our God.
So truly, therefore, do you exist, O Lord, my God, that you can not be conceived not to exist; and rightly. For, if a mind could conceive of a being better than you, the creature would rise above the Creator; and this is most absurd. And, indeed, whatever else there is, except you alone, can be conceived not to exist. To you alone, therefore, it belongs to exist more truly than all other beings, and hence in a higher degree than all others. For, whatever else exists does not exist so truly, and hence in a less degree it belongs to it to exist. Why, then, has the fool said in his heart, there is no God (Psalms xiv. 1), since it is so evident, to a rational mind, that you do exist in the highest degree of all? Why, except that he is dull and a fool?
1. IF one doubts or denies the existence of a being of such a nature that nothing greater than it can be conceived, he receives this answer:
The existence of this being is proved, in the first place, by the fact that he himself, in his doubt or denial regarding this being, already has it in his understanding; for in hearing it spoken of he understands what is spoken of. It is proved, therefore, by the fact that what he understands must exist not only in his understanding, but in reality also.
And the proof of this is as follows. — It is a greater thing to exist both in the understanding and in reality than to be in the understanding alone. And if this being is in the understanding alone, whatever has even in the past existed in reality will be greater than this being. And so that which was greater than all beings will be less than some being, and will not be greater than all: which is a manifest contradiction.
And hence, that which is greater than all, already proved to be in the understanding, must exist not only in the understanding, but also in reality: for otherwise it will not be greater than all other beings.
So much for the assertion that this supreme nature already is in my understanding.
5. But that this being must exist, not only in the understanding but also in reality, is thus proved to me:
If it did not so exist, whatever exists in reality would be greater than it. And so the being which has been already proved to exist in my understanding, will not be greater than all other beings.
I still answer: if it should be said that a being which cannot be even conceived in terms of any fact, is in the understanding, I do not deny that this being is, accordingly, in my understanding. But since through this fact it can in no wise attain to real existence also, I do not yet concede to it that existence at all, until some certain proof of it shall be given.
For he who says that this being exists, because otherwise the being which is greater than all will not be greater than all, does not attend strictly enough to what he is saying. For I do not yet say, no, I even deny or doubt that this being is greater than any real object. Nor do I concede to it any other existence than this (if it should be called existence) which it has when the mind, according to a word merely heard, tries to form the image of an object absolutely unknown to it.
How, then, is the veritable existence of that being proved to me from the assumption, by hypothesis, that it is greater than all other beings? For I should still deny this, or doubt your demonstration of it, to this extent, that I should not admit that this being is in my understanding and concept even in the way in which many objects whose real existence is uncertain and doubtful, are in my understanding and concept. For it should be proved first that this being itself really exists somewhere; and then, from the fact that it is greater than all, we shall not hesitate to infer that it also subsists in itself.
6. For example: it is said that somewhere in the ocean is an island, which, because of the difficulty, or rather the impossibility, of discovering what does not exist, is called the lost island. And they say that this island has an inestimable wealth of all manner of riches and delicacies in greater abundance than is told of the Islands of the Blest; and that having no owner or inhabitant, it is more excellent than all other countries, which are inhabited by mankind, in the abundance with which it is stored.
Now if some one should tell me that there is such an island, I should easily understand his words, in which there is no difficulty. But suppose that he went on to say, as if by a logical inference: “You can no longer doubt that this island which is more excellent than all lands exists somewhere, since you have no doubt that it is in your understanding. And since it is more excellent not to be in the understanding alone, but to exist both in the understanding and in reality, for this reason it must exist. For if it does not exist, any land which really exists will be more excellent than it; and so the island already understood by you to be more excellent will not be more excellent.”
If a man should try to prove to me by such reasoning that this island truly exists, and that its existence should no longer be doubted, either I should believe that he was jesting, or I know not which I ought to regard as the greater fool: myself, supposing that I should allow this proof; or him, if he should suppose that he had established with any certainty the existence of this island. For he ought to show first that the hypothetical excellence of this island exists as a real and indubitable fact, and in no wise as any unreal object, or one whose existence is uncertain, in my understanding.
IT was a fool against whom the argument of my Proslogium was directed. Seeing, however, that the author of these objections is by no means a fool, and is a Catholic, speaking in behalf of the fool, I think it sufficient that I answer the Catholic.
A general refutation of Gaunilo’s argument. It is shown that a being than which a greater cannot be conceived exists in reality.
You say — whosoever you may be, who say that a fool is capable of making these statements — that a being than which a greater cannot be conceived is not in the understanding in any other sense than that in which a being that is altogether inconceivable in terms of reality, is in the understanding. You say that the inference that this being exists in reality, from the fact that it is in the understanding, is no more just than the inference that a lost island most certainly exists, from the fact that when it is described the hearer does not doubt that it is in his understanding.
But I say: if a being than which a greater is inconceivable is not understood or conceived, and is not in the understanding or in concept, certainly either God is not a being than which a greater is inconceivable, or else he is not understood or conceived, and is not in the understanding or in concept. But I call on your faith and conscience to attest that this is most false. Hence, that than which a greater cannot be conceived is truly understood and conceived, and is in the understanding and in concept. Therefore either the grounds on which you try to controvert me are not true, or else the inference which you think to base logically on those grounds is not justified.
But you hold, moreover, that supposing that a being than which a greater cannot be conceived is understood, it does not follow that this being is in the understanding; nor, if it is in the understanding, does it therefore exist in reality.
In answer to this, I maintain positively: if that being can be even conceived to be, it must exist in reality. For that than which a greater is inconceivable cannot be conceived except as without beginning. But whatever can be conceived to exist, and does not exist, can be conceived to exist through a beginning. Hence what can be conceived to exist, but does not exist, is not the being than which a greater cannot be conceived. Therefore, if such a being can be conceived to exist, necessarily it does exist.
Furthermore: if it can be conceived at all, it must exist. For no one who denies or doubts the existence of a being than which a greater is inconceivable, denies or doubts that if it did exist, its non-existence, either in reality or in the understanding, would be impossible. For otherwise it would not be a being than which a greater cannot be conceived. But as to whatever can be conceived, but does not exist — if there were such a being, its non-existence, either in reality or in the understanding, would be possible. Therefore if a being than which a greater is inconceivable can be even conceived, it cannot be nonexistent.
But let us suppose that it does not exist, even if it can be conceived. Whatever can be conceived, but does not exist, if it existed, would not be a being than which a greater is inconceivable. If, then, there were a being a greater than which is inconceivable, it would not be a being than which a greater is inconceivable: which is most absurd. Hence, it is false to deny that a being than which a greater cannot be conceived exists, if it can be even conceived; much the more, therefore, if it can be understood or can be in the understanding.
Moreover, I will venture to make this assertion: without doubt, whatever at any place or at any time does not exist — even if it does exist at some place or at some time — can be conceived to exist nowhere and never, as at some place and at some time it does not exist. For what did not exist yesterday, and exists to-day, as it is understood not to have existed yesterday, so it can be apprehended by the intelligence that it never exists. And what is not here, and is elsewhere, can be conceived to be nowhere, just as it is not here. So with regard to an object of which the individual parts do not exist at the same places or times: all its parts and therefore its very whole can be conceived to exist nowhere or never.
For, although time is said to exist always, and the world everywhere, yet time does not as a whole exist always, nor the world as a whole everywhere. And as individual parts of time do not exist when others exist, so they can be conceived never to exist. And so it can be apprehended by the intelligence that individual parts of the world exist nowhere, as they do not exist where other parts exist. Moreover, what is composed of parts can be dissolved in concept, and be non-existent. Therefore, whatever at any place or at any time does not exist as a whole, even if it is existent, can be conceived not to exist.
But that than which a greater cannot be conceived, if it exists, cannot be conceived not to exist. Otherwise, it is not a being than which a greater cannot be conceived: which is inconsistent. By no means, then, does it at any place or at any time fail to exist as a whole: but it exists as a whole everywhere and always.
Do you believe that this being can in some way be conceived or understood, or that the being with regard to which these things are understood can be in concept or in the understanding? For if it cannot, these things cannot be understood with reference to it. But if you say that it is not understood and that it is not in the understanding, because it is not thoroughly understood; you should say that a man who cannot face the direct rays of the sun does not see the light of day, which is none other than the sunlight. Assuredly a being than which a greater cannot be conceived exists, and is in the understanding, at least to this extent — that these statements regarding it are understood.
The argument is continued. It is shown that a being than which a greater is inconceivable can be conceived, and also, in so far, exists.
I HAVE said, then, in the argument which you dispute, that when the fool hears mentioned a being than which a greater is inconceivable, he understands what he hears. Certainly a man who does not understand when a familiar language is spoken, has no understanding at all, or a very dull one. Moreover, I have said that if this being is understood, it is in the understanding. Is that in no understanding which has been proved necessarily to exist in the reality of fact?
But you will say that although it is in the understanding, it does not follow that it is understood. But observe that the fact of its being understood does necessitate its being in the understanding. For as what is conceived, is conceived by conception, and what is conceived by conception, as it is conceived, so is in conception; so what is understood, is understood by understanding, and what is understood by understanding, as it is understood, so is in the understanding. What can be more clear than this?
After this, I have said that if it is even in the understanding alone, it can be conceived also to exist in reality, which is greater. If, then, it is in the understanding alone, obviously the very being than which greater cannot be conceived is one than which a greater can be conceived. What is more logical? For if it exists even in the understanding alone, can it not be conceived also to exist in reality? And if it can be so conceived, does not he who conceives of this conceive of a thing greater than that being, if it exists in the understanding alone? What more consistent inference, then, can be made than this: that if a being than which a greater cannot be conceived is in the understanding alone, it is not that than which a greater cannot be conceived?
But, assuredly, in no understanding is a being than which a greater is conceivable a being than which a greater is inconceivable. Does it not follow, then, that if a being than which a greater cannot be conceived is in any understanding, it does not exist in the understanding alone? For if it is in the understanding alone, it is a being than which a greater can be conceived, which is inconsistent with the hypothesis.
A criticism of Gaunilo’s example, in which he tries to show that in this way the real existence of a lost island might be inferred from the fact of its being conceived.
BUT, you say, it is as if one should suppose an island in the ocean, which surpasses all lands in its fertility, and which, because of the difficulty, or the impossibility, of discovering what does not exist, is called a lost island; and should say that the be no doubt that this island truly exists in reality, for this reason, that one who hears it described easily understands what he hears.
Now I promise confidently that if any man shall devise anything existing either in reality or in concept alone (except that than which a greater be conceived) to which he can adapt the sequence of my reasoning, I will discover that thing, and will give him his lost island, not to be lost again.
But it now appears that this being than which a greater is inconceivable cannot be conceived not to be, because it exists on so assured a ground of truth; for otherwise it would not exist at all.
Hence, if any one says that he conceives this being not to exist, I say that at the time when he conceives of this either he conceives of a being than which a greater is inconceivable, or he does not conceive at all. If he does not conceive, he does not conceive of the non-existence of that of which he does not conceive. But if he does conceive, he certainly conceives of a being which cannot be even conceived not to exist. For if it could be conceived not to exist, it could be conceived to have a beginning and an end. But this is impossible.
He, then, who conceives of this being conceives of a being which cannot be even conceived not to exist; but he who conceives of this being does not conceive that it does not exist; else he conceives what is inconceivable. The non-existence, then, of that than which a greater cannot be conceived is inconceivable.
Excerpted from: Internet Medieval Source Book.
THE EXISTENCE OF GOD
FIRST ARTICLE [I, Q. 2, Art. 1]
Whether the Existence of God Is Self-Evident?
Obj. 2: Further, those things are said to be self-evident which are known as soon as the terms are known, which the Philosopher (1 Poster. iii) says is true of the first principles of demonstration. Thus, when the nature of a whole and of a part is known, it is at once recognized that every whole is greater than its part. But as soon as the signification of the word “God” is understood, it is at once seen that God exists. For by this word is signified that thing than which nothing greater can be conceived. But that which exists actually and mentally is greater than that which exists only mentally. Therefore, since as soon as the word “God” is understood it exists mentally, it also follows that it exists actually. Therefore the proposition “God exists” is self-evident.
Reply Obj. 2: Perhaps not everyone who hears this word “God” understands it to signify something than which nothing greater can be thought, seeing that some have believed God to be a body. Yet, granted that everyone understands that by this word “God” is signified something than which nothing greater can be thought, nevertheless, it does not therefore follow that he understands that what the word signifies exists actually, but only that it exists mentally. Nor can it be argued that it actually exists, unless it be admitted that there actually exists something than which nothing greater can be thought; and this precisely is not admitted by those who hold that God does not exist.