Epistle of Mathetes to Diognetus The invisible soul is guarded by the visible body, and Christians are known indeed to be in the world, but their godliness remains invisible. The flesh hates the soul, and wars against it,[27] Epistle of Polycarp to the Philippians the lusts that are in the world, since "every lust warreth against the spirit; "[36] Clement of Alexandria Stromata Book III Quocirca admirabilis quoque Petrus: "Charissimi, inquit, obsecro vos tanquam advernas et peregrinos, abstinete vos a carnalibus desideriis, quae militant adversus animam, conversationem vestram inter gentes habentes bonam: quoniam sic est voluntas Dei, ut bene facientes obmutescere faciatis imprudentium hominum ignorantiam; quasi liberi, et non quasi velamen habentes malitiae libertatem, sed ut servi Dei."[122] Cyprian Epistle VI And similarly Peter exhorts: "As strangers," says he, "and pilgrims, abstain from fleshly lusts, which war against the soul, having your conversation honest among the Gentiles; that whereas they speak against you as evil-doers, they may by your good works, which they shall behold, glorify the Lord."[8] Didache 4. Abstain thou from fleshly and worldly lusts.[11] Constitutions of the Holy Apostles Book VII Avoid not the persons, but the sentiments, of the wicked. "Abstain from fleshly and worldly lusts."[17]