Psalms 135:6

"All whatsoever the Lord willed, He made in the heaven, and in the earth, in the sea, and in all its deep places" [Psalm 135:6]. Who can comprehend these things? Who can enumerate the works of the Lord in the heaven and earth, in the sea, and in all deep places? Yet if we cannot comprehend them all, we should believe and hold them without question, because whatever creature is in heaven, whatever is in earth, whatever is in the sea and in all deep places, has been made by the Lord. ...

But since I said that the Omnipotent can only not do what he does not will, lest anyone thinks I rashly said that the Omnipotent cannot do anything, the blessed Apostle also said: If we do not believe, he remains faithful, he cannot deny himself. But because he does not will it, he cannot, for he cannot will it. For justice cannot will to do what is unjust, wisdom cannot will what is foolish, nor can truth will what is false. Hence we are admonished that God is omnipotent, not only in what the Apostle says: He cannot deny himself, but in many things he cannot. Behold, I say, and dare to say in his truth, which I do not dare to deny: God the Omnipotent cannot die, cannot change, cannot be deceived, cannot become miserable, cannot be overcome. These and similar things, far be it from the Omnipotent to be able to do. And therefore, not only does the truth show that he is omnipotent because he cannot do these things, but it also compels the truth to state that he is not omnipotent who can do these things. For God is whatever he wills to be; therefore he is eternal, immutable, truthful, blessed, and invincible as he wills to be. Therefore, if he can be what he does not will, he is not omnipotent; but he is omnipotent, therefore he can do whatever he wills. And thus, what he does not will, he cannot be; for which reason he is called omnipotent, because he can do whatever he wills. Of whom the Psalm also says: In heaven and on earth, he has done all that he willed.

It is not, then, to be doubted that men's wills cannot, so as to prevent His doing what he wills, withstand the will of God, "who hath done all things whatsoever He pleased in heaven and in earth," and who also "has done those things that are to come;" since He does even concerning the wills themselves of men what He will, when He will. Unless, perchance (to mention some things among many), when God willed to give the kingdom to Saul, it was so in the power of the Israelites, as it certainly was placed in their will, either to subject themselves or not to the man in question, that they could even prevail to withstand God. God, however, did not do this, save by the will of the men themselves, because he beyond doubt had the most omnipotent power of inclining men's hearts whither it pleased Him. For thus it is written: "And Samuel sent the people away, and every one went away unto his own place. And Saul went away to his house in Gibeah: and there went away with Saul mighty men, whose hearts the Lord touched. And pestilent children said, Who shall save us? This man? And they despised him, and brought him no presents." Will any one say that any of those whose hearts the Lord touched to go with Saul would not have gone with him, or that any of those pestilent fellows, whose hearts He did not touch to do this, would have gone?

Providence, then, is the solicitude that God has for existing things. And again, providence is that will of God by which all existing things receive suitable guidance through to their end. But, if providence is God's will, then, according to right reason, everything that has come about through providence has quite necessarily come about in the best manner and that most befitting God, so that it could not have happened in a better way.

He does what he pleases, because he pleases, and gives not an account of any of his matters. He has an almighty power and can do what he will; if he will work, none shall hinder. This absolute almighty power is of universal extent; he does what he will in heaven, in earth, in the seas, and in all the deep places that are in the bottom of the sea or the bowels of the earth.