God: The Fullness of Life
The Fullness of Life: the Foundation of Classical Theism
Scriptural Reasoning for the Boundless Timeless Perfection of God
Aquinas’ Five Ways Demonstrate the Necessity and Nature of God.
Summa Theologica I q.2.a.3 resp
Why must God be perfect?
God is perfect because there is no “potential” in God.
God is the first mover. Nothing made God move. God must timelessly be “pure act” (actus purus) or perfect life or the fullness of life.
God is perfect because God necessarily is his own essence and existence.
Therefore, if the existence of a thing differs from its essence, this existence must be caused either by some exterior agent or by its essential principles.
existence is that which makes every form or nature actual; for goodness and humanity are spoken of as actual, only because they are spoken of as existing
All created perfections are in God. Hence He is spoken of as universally perfect, because He lacks not (says the Commentator, Metaph. v) any excellence which may be found in any genus.
First, because whatever perfection exists in an effect must be found in the effective cause
God is existence itself, of itself subsistent
Anselm’s Monologium 1.
There is a being which is best, and greatest, and highest of all existing beings.
For, since all desire to enjoy only those things which they suppose to be good, it is natural that this man should, at some time, turn his mind’s eye to the examination of that cause by which these things are good, which he does not desire, except as he judges them to be good.
Finally, there can be no “accidental” attributes in God.
All God’s Attributes are Established in His Primacy
On the other hand, it is accepted that all the attributes of God are grounded on this aseity, independence, and primacy, which could be made plain through induction, in the following ways. (1) Unity: for that which is the absolutely first being cannot be but one. But if several such beings should be conceived, none will be absolutely first, since one does not precede another. (2) Immutability: for if this being were changed, it would be changed by another, and to that extent that other would undoubtedly be prior to the absolutely first being, which is contradictory. (3) Infinity: for that which is limited, is limited by another, for nothing limits itself and restricts its own perfection, and that other would certainly be prior to the absolutely first being. (4) Simplicity: for that which is composed is, by the same measure, composed by another that is prior to it. (5) Life: for since there is no imperfection involved in the concept of life, it cannot but belong to the one who is simply from himself, and thus it applies to the one to whom this perfection cannot be denied by another. By the same consequence, (6) intellect: for by common consent it is more perfect to understand than not to understand. And also (7) will: for as all confess, to operate from free choice is more perfect than to act by nature. Equally, (8) omnipotence: for he who does not admit a being prior to himself also cannot be restricted and limited in his power. (9) You could easily demonstrate similar things concerning the virtues of the intellect and the will—wisdom, goodness, grace, holiness, and others—which, since they without any doubt imply absolute perfection, cannot be removed from the absolutely first being, because if they were removed, they would be removed by another, who would then become prior to the absolutely first being.