Theophylact of Ohrid

Because the above-mentioned disciples were troubled with too much doubt, the Lord reproves them, saying, O fools, (for they almost used the same words as those who stood by the cross, He saved others, himself he cannot save.) And He proceeds, and slow of heart to believe all that the prophets have spoken. For it is possible to believe some of these things and not all; as if a man should believe what the Prophets say of the cross of Christ, as in the Psalms, They pierced my hands and my feet; (Ps. 22:16.) but should not believe what they say of the resurrection, as, Thou shall not suffer thy Holy One to see corruption. (Ps. 16:10.) But it becomes us in all things to give faith to the Prophets, as well in the glorious things which they predicted of Christ, as the inglorious, since through the suffering of evil things is the entrance into glory. Hence it follows, Ought not Christ to have suffered these things, and so to enter into his glory? that is, as respects His humanity.