The Infinite Being is most simple, or not compound. Were he compound, his parts would be either all finite, or infinite, or one infinite and the others finite. None of these suppositions are possible, therefore, he is not compound.
1. Several finite things cannot produce an infinite or an illimitable, as there would always be a first and a last.
2. Many infinite beings are inconceivable; for, if there were several, they would have to differ from each other by some perfection. Now from the moment one would have a perfection, the other one lacks, the latter would not be infinite. Therefore, God cannot be a compound of infinite parts.
3. If one is infinite, nothing can be added to it. Finite parts could not belong to the infinite essence, else they would communicate their limitations to God.
Therefore, the Infinite Being is not composite, but simple or spiritual. Therefore, he is not, nor ever was, a man, who is a composite being.
II.
Above, I proved God's immutability from the Bible; now I prove it from philosophy, or the light of reason.
Mutation or change is the passing from one state into another. The Infinite Being is not liable to change, as change implies an imperfection in the being susceptible of it, as that being had not in the previous state what it has in the subsequent, or vice versa. God having all perfections must be unchangeable. Therefore, he is not a man grown into a God.
The Necessary Being is such that he could not exist, nor exist otherwise. He cannot receive his existence, nor lose it. So he cannot change with regard to his existence; nor can he change with regard to his mode of existence. His perfections being infinite cannot increase; nor can they wane or decrease, else there would be an imperfection in him, and he would no longer be infinite, or God. Therefore, God is unchangeable. Therefore, he never was what we are.
God is pure essence (I Am Who I Am), pure actuality or act.