Thomas Aquinas, on Ps 39:8

“Then said I, Behold I come. In the head of the book it is written of me”

“Next he shows his resolve to obey, according to his humanity. Now there are two things principally in a person: namely the will and the intellect. The will of a person ought to be subjected to the divine will, and the intellect ought to be directed according to the law of God. And therefore he says, "O my God," Father, insofar as God. Or, "my God," insofar as man, "I have willed to do your will," which is also my will insofar as God; or, "my God," insofar as man, "I have willed to do your will," which is also my will insofar as God. Lk. 22: "Not my will, but yours be done." Likewise, my intellect is directed according to you; hence he says, "And your law in the midst of my heart"; and he says, "in the midst," because he perfectly knows the divine reasons.”

Imported from an open dataset — not yet checked against the printed edition.