[52] [cap.11] This then is what appears to be said of these holy men; and it is indicative of a nature more remote from our knowledge than, and much superior to, that which exists in the objects of outward sense; for the sacred word appears thoroughly to investigate and to describe the different dispositions of the soul, being all of them good, the one aiming at what is good by means of instruction, the second by nature, the last by practise; for the first, who is named Abraham, is a symbol of that virtue which is derived from instruction; the intermediate Isaac is an emblem of natural virtue; the third, Jacob, of that virtue which is devoted to and derived from practise.