Bede the Venerable — as excerpted in the Catena Aurea on Mark 8:34-38

“(in Marc. 2, 36) Or else He says this, because in time of persecution, our life is to be laid aside, but in time of peace, our earthly desires are to be broken, which He implies when He says, For what shall it profit a man, &c. But we are often hindered by a habit of shamefacedness, from expressing with our voice the rectitude which we preserve in our hearts; and therefore it is added, For whosoever shall confess me and my words in this adulterous and sinful generation, him also shall the Son of man confess, when he cometh in the glory of his Father with the holy angels.”