[154] And these statements appear to me to be dictated by a philosophy which is symbolical rather than strictly accurate. For no trees of life or of knowledge have ever at any previous time appeared upon the earth, nor is it likely that any will appear hereafter. But I rather conceive that Moses was speaking in an allegorical spirit, intending by his paradise to intimate the dominant character of the soul, which is full of innumerable opinions as this figurative paradise was of trees. And by the tree of life he was shadowing out the greatest of the virtues—namely, piety towards the gods, by means of which the soul is made immortal; and by the tree which had the knowledge of good and evil, he was intimating that wisdom and moderation, by means of which things, contrary in their nature to one another, are distinguished.