Chapter 3 — The Definition Concerning the Two Wills and Two Energies
Section 8. We glorify two natural operations indivisibly, immutably, inconfusedly, inseparably in the same our Lord Jesus Christ our true God, that is to say a divine operation and a human operation, according to the divine preacher Leo, who most distinctly asserts: 'For each form does in communion with the other what pertains properly to it; the Word, namely, performing what pertains to the Word, and the flesh carrying out what pertains to the flesh.'