Hear and listen, you covetous one: the Apostle explains to you in another place more clearly this that he said, "Let no man seek his own, but another's." He says of himself, "Not seeking my own profit, but the profit of many, that they may be saved." This Peter understood not yet when he desired to live on the mount with Christ. He was reserving this for you, Peter, after death. But now He says Himself, "Come down, to labour in the earth; in the earth to serve, to be despised, and crucified in the earth. The Life came down, that He might be slain; the Bread came down, that He might hunger; the Way came down, that life might be wearied in the way; the Fountain came down, that He might thirst; and do you refuse to labour? 'Seek not your own.' Have charity, preach the truth; so shall you come to eternity, where you shall find security."
Augustine, Sermon 28.6.