Tertullian, Apolog. c. 21; De Idololatria, c. 17, 18. Origen contra Celsum, 1. v. p. 253 [c. 33, tom. i. p. 602, ed. Bened.], 1. vii. p. 349 [e. 26, p.712], 1. viii. p. 423-428 [c. 68 sq. p. 793 sq.].