Cyprian

That he who has attained to trust, having put off the former man, ought to regard only celestial and spiritual things, and to give no heed to the world which he has already renounced...

Also in the same place: "Love not the world, neither the things that are in the world. If any man loveth the world, the love of the Father is not in him. Because everything which is in the world is lust of the flesh, and lust of the eyes, and the ambition of this world, which is not of the Father, but of the lust of this world. And the world shall pass away with its lust. But he that doeth the will of God abideth for ever, even as God abideth for ever." Also in the first Epistle of Paul to the Corinthians: "Purge out the old leaven, that ye may be a new dough, as ye are unleavened. For also Christ our passover is sacrificed. Therefore let us celebrate the feast, not in the old leaven, nor in the leaven of malice and wickedness, but in the unleavened bread of sincerity and truth."