Chapter XVII.—The Sethian Doctrines to Be Learned from the “Paraphrase of Seth.” The opinion of the Sethians appears to us to have been sufficiently elucidated. If, however, any one is desirous of learning the entire doctrine according to them, let him read a book inscribed Paraphrase of Seth ; for all their secret tenets he will find deposited there. But since we have explained the opinions entertained by the Sethians, let us see also what are the doctrines advanced by Justinus.