2 Corinthians 12:15

"I will most gladly spend and be spent for your souls." 'For the law of nature indeed has commanded the parents to lay up for the children; but I do not do this only, but I give myself also besides.' And this lavishness of his, the not only not receiving, but giving also besides, is not in common sort but accompanied with great liberality, and out of his own want; for the words, "I will be spent," are of one who would imply this. 'For should it be necessary to spend my very flesh, I will not spare it for your salvation.' And that which follows contains at once accusation and love, "though the more abundantly I love you, the less I be loved." 'And I do this,' he says, 'for the sake of those who are beloved by me, yet love me not equally.' Observe then, now, how many steps there are in this matter. He had a right to receive, but he did not receive; here is good work the first: and this, though in want; the second; and though preaching to them, the third; he gives besides, the fourth; and not merely gives, but lavishly too, the fifth; not money only, but himself, the sixth; for those who loved him not greatly, the seventh; and for those whom he greatly loved, the eighth.

Let us then also emulate this man! For it is a serious charge, the not loving even; but becomes more serious, when although one is loved he loveth not. For if he that loveth one that loveth him be no better than the publicans; he that doth not so much as this ranks with the beasts; yea rather, is even below them. What sayest thou, O man? Lovest thou not him that loveth thee? What then dost thou live for? Wherein wilt thou be of use hereafter? in what sort of matters? in public? in private? By no means; for nothing is more useless than a man that knows not to love.