Hebrews 2:10
Christ Made Perfect: A Reference to His Passible Humanity
St. Gregory clarifies that when scripture describes Jesus suffering, praying, or learning obedience, it refers to His human nature. His divine nature is unchangeable, but He took on humanity which could experience these things.
There remains for us to interpret the passage about His receiving commandment, and having kept His Commandments, and done always those things that please Him; and further concerning His being made perfect, and His exaltation, and His learning obedience by the things which He suffered; and also His High Priesthood, and His Oblation, and His Betrayal, and His prayer to Him That was able to save Him from death, and His Agony and Bloody Sweat and Prayer, and such like things; if it were not evident to every one that such words are concerned, not with That Nature Which is unchangeable and above all capacity of suffering, but with the passible Humanity.