My will, therefore, He took to Himself, my grief. In confidence I call it grief, because I preach His Cross. Mine is the will which He called His own, for as man He bore my grief, as man He spoke, and therefore said, "Not as I will, but as You will." Mine was the grief, and mine the heaviness with which He bore it, for no man exults when at the point to die. With me and for me He suffers, for me He is sad, for me He is heavy. In my stead, therefore, and in me He grieved Who had no cause to grieve for Himself.
Not Your wounds, but mine, hurt You, Lord Jesus; not Your death, but our weakness, even as the Prophet says: "For He is afflicted for our sakes" (Isaiah 53:4) — and we, Lord, esteemed You afflicted, when You grieved not for Yourself, but for me.
And what wonder if He grieved for all, Who wept for one? What wonder if, in the hour of death, He is heavy for all, Who wept when at the point toraise Lazarus from the dead? Then, indeed, He was moved by a loving sister's tears, for they touched His human heart,— here by secret grief He brought it to pass that, even as His death made an end of death, and His stripes healed our scars, so also His sorrow took away our sorrow.
As being man, therefore, He doubts; as man He is amazed. Neither His power nor His Godhead is amazed, but His soul; He is amazed by consequence of having taken human infirmity upon Him. Seeing, then, that He took upon Himself a soul He also took the affections of a soul, for God could not have been distressed or have died in respect of His being God. Finally, He cried: "My God, My God, why have You forsaken Me?" As being man, therefore, He speaks, bearing with Him my terrors, for when we are in the midst of dangers we think ourselves abandoned by God. As man, therefore, He is distressed, as man He weeps, as man He is crucified.
Ambrose of Milan, Exposition of the Christian Faith, Bk. II, Ch. 7.