My Soul is very Sorrowful

Why does the Lord Jesus say "my soul is very sorrowful, even to death?" In Gethsemane the Scriptures reveal to us the inner life of our Lord in a manner like nowhere else. He is troubled by death and all that it represents, and he knows He must come face to face with it on his own as he is about to be forsaken by his Father and bear the punishment of his people's sins. R. A. Finlayson warns us to tread carefully as we look into Gethsemane: "Gethsemane is not a field for intellect, it is a sanctuary for faith. There was transacted something that brings us completely out of our depth, yet something that has such a distinct bearing on our redemption that we dare not pass it by." (R. A. Finlayson, The Cross in the Experience of our Lord.)