Of God and His Creatures

This reads like an early version of the saying, Man proposes, but God disposes, interpreted to mean that man's proposing is not of God. We must remember that man is upheld by God in action as he is upheld by God in existence: that esse, posse, agere in man are all of God. Sin is a certain defect of action, a lack of proportion, of order, or opportuneness. But on its physical side sin is not evil, and as a physical thing it is wrought by God and man jointly, like any other action.

Of God and His Creatures: 3.89