He Who was there in the likeness of mankind, and as a portion of creation, was God, Who transcends all created things!
He Who dwells in the high and lofty place was abased from His glory to be in poverty like unto us!
And He Who, as God, is Lord of all, and King of all, was in the likeness of a slave, and in the measure of a slave!
This is the faith the Saviour crowns; to those thus minded He extends His bountiful right hand.
[…] When, however, the disciple [Peter] had professed his faith, He charged them, it says, and commanded them to tell it to no man.
“For the Son of man,” He said, “is about to suffer many things, and be rejected, and killed, and the third day He shall rise again.”
And yet how was it not rather the duty of disciples to proclaim Him everywhere? For this was the very business of those appointed by Him to the apostleship.
But as the sacred Scripture says, “There is a time for everything.” There were things yet unfulfilled which must also be included in their preaching of Him.
These were the Cross; the passion; the death in the flesh; the resurrection from the dead; that great and truly glorious sign by which testimony is borne that the Emmanuel is truly God, and by nature the Son of God the Father.
He utterly abolished death, and effaced destruction, and spoiled hell, and overthrew the tyranny of the enemy, and took away the sin of the world, and opened the gates above to the dwellers upon earth, and united earth to heaven.
And these things proved Him to be, as I said, in truth God.
He commanded them, therefore, to guard the mystery by a seasonable silence until the whole plan of the dispensation should arrive at a suitable conclusion.
For then, when He arose from the dead, He gave commandment that the mystery should be revealed to all the inhabitants of the earth, setting before every man justification by faith, and the cleansing efficacy of holy baptism.
For He said, “All power is given unto Me in heaven and in earth: Go ye, make disciples of all nations, baptizing them in the Name of the Father, and of the Son, and of the Holy Ghost, and teaching them to observe all those things which I have commanded you. And lo! I am with you always, even unto the end of the world.”
For Christ is with us and in us by the Holy Ghost, and dwells in the souls of us all.
Cyril of Alexandria (c. 376-444): Commentary on Luke, Sermon 49 (on Luke 9:18-22) [slightly adapted].