Gregory the Great
Catena Aurea · Lukasevangelium 9
And he said to them all, If any man will come after me, let him deny himself, and take up his cross daily, and follow me. For whosoever will save his life shall lose it: but whosoever will lose his life for my sake, the same shall save it. For what is a man advantaged, if he gain the whole world, and lose himself, or be cast away? For whosoever shall be ashamed of me and of my words, of him shall the Son of man be ashamed, when he shall come in his own glory, and in his Father’s, and of the holy angels. But I tell you of a truth, there be some standing here, which shall not taste of death, till they see the kingdom of God.
(Hom. 32. in Ev.) Since then the holy Church has one time of persecution, another time of peace, our Lord has noticed both times in His command to us. For at the time of persecution we must lay down our soul, that is our life, which He signified, saying, Whosoever shall lose his life. But in time of peace, those things which have the greatest power to subdue us, our earthly desires, must be vanquished; which He signified, saying, What does it profit a man, &c. Now we commonly despise all fleeting things, but still we are so checked by that feeling of shame so common to man, that we are yet unable to express in words the uprightness which we preserve in our hearts. But to this wound the Lord indeed subjoins a suitable application, saying, For whoever shall be ashamed of me and my words, of him shall the Son of man be ashamed.