Particularly influential were his "Hymns Against Heresies". Ephrem used these to warn his flock of the heresies that threatened to divide the early church. He lamented that the faithful were "tossed to and fro and carried around with every wind of doctrine, by the cunning of men, by their craftiness and deceitful wiles" (Eph 4:14). He devised hymns laden with doctrinal details to inoculate right-thinking Christians against heresies such as docetism. The "Hymns Against Heresies" employ colourful metaphors to describe the Incarnation of Christ as fully human and divine. Ephrem asserts that Christ's unity of humanity and divinity represents peace, perfection and salvation; in contrast, docetism and other heresies sought to divide or reduce Christ's nature and, in doing so, rend and devalue Christ's followers with their false teachings.