Tatian's Address to the Greeks

But further, it becomes us now to seek for what we once had, but have lost, to unite the soul with the Holy Spirit, and to strive after union with God. The human soul consists of many parts, and is not simple; it is composite, so as to manifest itself through the body; for neither could it ever appear by itself without the body, nor does the flesh rise again without the soul. Man is not, as the croaking philosophers say, merely a rational animal, capable of understanding and knowledge; for, according to them, even irrational creatures appear possessed of understanding and knowledge.