Dominica Secunda in Quadragesima: "the kingly splendour, which is the right of the Manhood taken into God"

From the Holy Gospel according to Matthew
Matt 17:1-9
At that time, Jesus taketh unto him Peter and James, and John his brother, and bringeth them up into a high mountain apart: And he was transfigured before them. And so on.

Homily by Pope St. Leo the Great. 
From a homily on the Transfiguration of the Lord.
Jesus took Peter, and James, and John his brother, and brought them up into an exceeding high mountain apart, and manifested forth the brightness of His glory. Hitherto, though they understood that there was in Him the Majesty of God, they knew not the power of that Body which veiled the Godhead. And therefore He had individually and markedly promised to some of the disciples that had stood by Him Matth. xvi. 28 that they should “not taste of death till they had seen the Son of Man coming in His kingdom”, that is, in the kingly splendour, which is the right of the Manhood taken into God, and which He willed to make visible to those three men. This it was that they saw, for the unspeakable and unapproachable vision of the Godhead Himself which will be the everlasting life of the pure in heart, Matth. v. 8 can no man, who is still burdened with a dying body, see and live.