24 It is for him to wish to remain long in the world whom the world delights, whom this life, flattering and deceiving, invites by the enticements of earthly pleasure. Again, since the world hates the Christian, why do you love that which hates you? And why do you not rather follow Christ, who both redeemed you and loves you? John in his epistle cries and says, exhorting that we should not follow carnal desires and love the world. “Love not the world,” says he, “neither the things which are in the world.
If any man love the world, the love of the Father is not in him. For all that is in the world is the lust of the flesh, and the lust of the eyes, and the pride of life, which is not of the Father, but of the lust of the world. And the world shall pass away, and the lust thereof; but he who does the will of God abides for ever, even as God abides for ever.” Rather, beloved brethren, with a sound mind, with a firm faith, with a robust virtue, let us be prepared for the whole will of God: laying aside the fear of death, let us think on the immortality which follows.
By this let us show ourselves to be what we believe, that we do not grieve over the departure of those dear to us, and that when the day of our summons shall arrive, we come without delay and without resistance to the Lord when He Himself calls us.
Source: The Treatises of Cyprian (New Advent)