Catena Aurea on Matthew 26:36–38: John Damascene

Wherefore the passions of our nature were in Christ both by nature and beyond nature. By nature, because He left His flesh to suffer the things incidental to it; beyond nature, because these natural emotions did not in Him precede the will. For in Christ nothing befel of compulsion, but all was voluntary; with His will He hungered, with His will He feared, or was sorrowful.

Here His sorrow is declared, “Then saith he unto them, My soul is sorrowful even unto death.”