108. Lastly, you have read that the Father is both Lord and God: “O Lord my God, I will call upon Thee, hear Thou me.” Ps. xxx. [xxix.] 2. You find the Son to be both Lord and God, as you have read in the Gospel, that, when Thomas had touched the side of Christ, he said, “My Lord and my God.” S. John xx. 28. So in like manner as the Father is God and the Son Lord, so too the Son is God and the Father Lord. The holy designation changes from one to the other, the divine nature changes not, but the dignity remains unchangeable. For they are not [as it were] contributions gathered from bounty, but free-will gifts of natural love; for both Unity has its special property, and the special properties are bound together in unity.