“Then he took unto him the twelve, and said unto them, Behold, we go up to Jerusalem, and all things that are written by the prophets concerning the Son of man shall be accomplished.”
Luke 18:31 — Greek Interlinear
Church Fathers on Luke 18:31
The Savior foreseeing that the hearts of His disciples would be troubled at His Passion, tells them long before-hand both the suffering of His Passion and the glory of His Resurrection.
And knowing that there would arise certain heretics, saying, that Christ taught things contrary to the Law and the Prophets, He shows already that the voices of the Prophets had proclaimed the accomplishment of His Passion, and the glory which should follow.
He speaks with His disciples apart, concerning His Passion. For it was not fitting to publish this word to the multitudes, lest they should be troubled, but to His disciples He foretold it, that being habituated by expectation, they might be the more able to bear it.