2 Corinthians 5:13
2 “For whether we are beside ourselves, it is to God; or whether we are of sober mind, it is unto you.”
And if, says he, we have uttered any great thing, (for this is what he here calls being beside himself, as therefore in other places also he calls it folly) for God's sake we do this, lest ye thinking us to be worthless should despise us and perish; or if again any modest and lowly thing, it is for your sakes that you may learn to be lowly-minded. Or else, again, he means this. If any one thinks us to be mad, we seek for our reward from God, for Whose sake we are of this suspected; but if he thinks us sober, let him reap the advantage of our soberness. And again, in another way. Does any one say we are mad? For God's sake are we in such sort mad. Wherefore also he subjoins;
Source: Homilies on Second Corinthians (New Advent)