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those things are said to be self-evident to us the knowledge of which |
is naturally implanted in us, as we can see in regard to first |
principles. But as Damascene says (De Fide Orth. i, 1,3), "the |
knowledge of God is naturally implanted in all." Therefore the |
existence of God is self-evident. |
Objection 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. |
Objection 3: Further, the existence of truth is self-evident. For |
whoever denies the existence of truth grants that truth does not |
exist: and, if truth does not exist, then the proposition "Truth does |
not exist" is true: and if there is anything true, there must be |
truth. But God is truth itself: "I am the way, the truth, and the |
life" (John 14:6) Therefore "God exists" is self-evident. |
Contrary: No one can mentally admit the opposite of what is |
self-evident; as the Philosopher (Metaph. iv, lect. vi) states |
concerning the first principles of demonstration. But the opposite of |
the proposition "God is" can be mentally admitted: "The fool said in |
his heart, There is no God" (Ps. 52:1). Therefore, that God exists is |
not self-evident. |
Response: A thing can be self-evident in either of two ways: on |
the one hand, self-evident in itself, though not to us; on the other, |
self-evident in itself, and to us. A proposition is self-evident |
because the predicate is included in the essence of the subject, as |
"Man is an animal," for animal is contained in the essence of man. If, |
therefore the essence of the predicate and subject be known to all, |
the proposition will be self-evident to all; as is clear with regard |
to the first principles of demonstration, the terms of which are |
common things that no one is ignorant of, such as being and non-being, |
whole and part, and such like. If, however, there are some to whom the |
essence of the predicate and subject is unknown, the proposition will |
be self-evident in itself, but not to those who do not know the |
meaning of the predicate and subject of the proposition. Therefore, it |
happens, as Boethius says (Hebdom., the title of which is: "Whether |
all that is, is good"), "that there are some mental concepts |
self-evident only to the learned, as that incorporeal substances are |
not in space." Therefore I say that this proposition, "God exists," of |
itself is self-evident, for the predicate is the same as the subject, |
because God is His own existence as will be hereafter shown (Q. 3, |
Art. 4). Now because we do not know the essence of God, the proposition |
is not self-evident to us; but needs to be demonstrated by things that |
are more known to us, though less known in their nature--namely, by |
effects. |
Reply Objection 1: To know that God exists in a general and |
confused way is implanted in us by nature, inasmuch as God is man's |
beatitude. For man naturally desires happiness, and what is naturally |
desired by man must be naturally known to him. This, however, is not |
to know absolutely that God exists; just as to know that someone is |
approaching is not the same as to know that Peter is approaching, even |
though it is Peter who is approaching; for many there are who imagine |
that man's perfect good which is happiness, consists in riches, and |
others in pleasures, and others in something else. |
Reply Objection 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. |
Reply Objection 3: The existence of truth in general is |
self-evident but the existence of a Primal Truth is not self-evident |
to us. |
_______________________ |
SECOND ARTICLE [I, Q. 2, Art. 2] |
Whether It Can Be Demonstrated That God Exists? |
Objection 1: It seems that the existence of God cannot be |
demonstrated. For it is an article of faith that God exists. But what |
is of faith cannot be demonstrated, because a demonstration produces |
scientific knowledge; whereas faith is of the unseen (Heb. 11:1). |
Therefore it cannot be demonstrated that God exists. |
Objection 2: Further, the essence is the middle term of demonstration. |
But we cannot know in what God's essence consists, but solely in what |
it does not consist; as Damascene says (De Fide Orth. i, 4). Therefore |
we cannot demonstrate that God exists. |
Objection 3: Further, if the existence of God were demonstrated, this |