Luke 9:21

But our Lord Jesus Christ was at first unwilling to be preached, lest an uproar should arise; as it follows, And he straitly charged them, and commanded them to tell no man any thing. For many reasons He commands His disciples to be silent; to deceive the prince of this world, to reject boasting, to teach humility. Christ then would not boast and dost thou boast who art of ignoble birth? Likewise He did it to prevent rude and as yet imperfect disciples from being oppressed with the wonder of this awful announcement. They are then forbid to preach Him as the Son of God, that they might afterwards preach Him crucified. Perhaps because the Lord knew that the disciples would believe even the difficult mystery of the Passion and Resurrection, He wished to be Himself the proclaimer of His own Passion and Resurrection.

It was the duty then of the disciples to preach Him throughout the world. For this was the work of those who were chosen by Him to the office of the Apostleship. But as holy Scripture bears witness, There is a time for every thing. For it was fitting that the cross and resurrection should be accomplished, and then should follow the preaching of the Apostles; as it is spoken, saying, The Son of man must needs suffer many things.