John Chrysostom

Otherwise; He that disowns another, whether a brother, or a servant, or whosoever it be, he may see him beaten, or suffering aught else, and neither succours nor befriends him; thus it is he would have us deny our body, and whether it be beaten or afflicted in any other way, not to spare it. For this is to spare. So parents do then most spare their children when they hand them over to tutors, bidding them not to spare them. And that you should not think that this denial of self extends only to words or affronts, he shews to what degree we should deny ourselves, namely, to death the most shameful, even that of the cross; this He signifies when He says, And take up his cross, and follow me.