XXIV. (132) And he also, with a wish further to excite an irresistible desire of what is good, enjoins one to cleave to it; for he says, “Thou shalt fear the Lord thy God, and him only shalt thou serve; and thou shalt cleave to Him.”{66}{#de 10:20.} What, then, is this cleaving? What? Surely it is piety and faith; for these virtues adapt and invite the mind to incorruptible nature. For Abraham also, when he believed, is said to have “come near to God.”{67}{#ge 18:23.} (133) If, therefore, while you are walking you are neither fatigued, so as to give way and stumble, nor are so careless as to turn to either the right hand or to the left hand, and so to stray and miss the direct road which lies between the two; but if, imitating good runners, you finish the course of life without stumbling or error, you will deservedly obtain the crown and worthy prize of victory when you have arrived at your desired end. (134) For is not this the crown and the prize of victory not to miss the proposed end of one’s labours, but to arrive at that goal of prudence which is so difficult to be reached? What, then, is the object of having right wisdom? To be able to condemn one’s own folly and that of every created being. For to be aware that one knows nothing is the end of all knowledge, since there is only one wise being, who is also the only God. (135) On which account Moses very beautifully has represented the father of the universe as being also the inspector and superintendent of all that he has created, saying, “God saw all that he had made, and behold it was very Good.”{68}{#ge 1:31.} For it was not possible for any one to have an accurate view of all that had been created, except for the Creator. (136) Come, then, ye who are full of arrogance, and ignorance, and of exceeding insolence, ye that are wise in your own conceit, and who say not only that ye know accurately what each thing is, but that you are also able to explain the causes why it is so, showing daring with great rashness, as if ye had either been present at the creation of the world, and had actually seen how and from what each separate thing was made, or had been counsellors of the Creator concerning the things which were created. (137) Come, and at once abandoning all other things, learn to know yourselves, and tell us plainly what ye yourselves are in respect of your bodies, in respect of your souls, in respect of your external senses, and in respect of your reason. Tell us now with respect to one, and that the smallest, perhaps, of the senses, what sight is, and how it is that you see; tell us what hearing is, and how it is that you hear; tell us what