44 There was, then, no place for human anxiety and trepidation in that nature, which was more than human. It was superior to the ills of earthly flesh; a body not sprung from earthly elements, although His origin as Son of Man was due to the mystery of the conception by the Holy Ghost. The power of the Most High imparted its power to the body which the Virgin bare from the conception of the Holy Ghost. The animated body derives its conscious existence from association with a soul, which is diffused throughout it, and quickens it to perceive pains inflicted from without. Thus the soul, warned by the happy glow of its own heavenly faith and hope, soars above its own origin in the beginnings of an earthly body, and raises that body to union with itself in thought and spirit, so that it ceases to feel the suffering of that which, all the while, it suffers. Why need we then say more about the nature of the Lord's body, that of the Son of Man Who came down from heaven? Even earthly bodies can sometimes be made indifferent to the natural necessities of pain and fear.
Source: On the Trinity (New Advent)