X. (69) Now the symbols represented by the name of Abram are thus accurately defined; those conveyed under the name of Abraham are such as we shall proceed to demonstrate. The meanings now are three, "the father," and "elect," and "of sound." Now by the word "sound" here, we mean uttered speech; for the sounding organ of the living animal is the organ of speech. Of this faculty we say that the father is the mind, for it is from the mind, as from a fountain, that the stream of speech proceeds. The word "elect" belongs to the mind of the wise man, for whatever is most excellent is found in him; (70) therefore the man devoted to learning and occupied in the contemplation of sublime subjects, was sketched out according to the former characteristic marks, but the philosopher, or I should rather say the wise man, was exhibited in accordance with those of which we have just given an outline. Think not, then, any longer that the Deity bestows a change of names, but consider that what he gives is a correction of the moral character by means of symbols; (71) for having invited the nature of heaven, and whom some call a mathematician, to a participation in virtue, he made him wise and called him so. For having given an appropriate name to his transformed disposition, he named him, as the Hebrews would call it, "Abraham," but in the language of the Greeks, "the elect father of sound;" (72) for says he, On what account dost thou investigate the motions and periods of the stars? and why hast thou bounded up so high from the earth to the heavens? Is it merely that you may indulge your curiosity with respect to those matters? And what advantage could accrue to you from all this curiosity? What destruction of pleasure would is cause? What defeat of appetite? What dissolution of pain or fear? What eradication of the passions which disturb and agitate the soul? (73) For as there is no advantage in trees unless they are productive of fruit, so in the same way there is no use in the study of natural philosophy unless it is likely to confer upon a man the acquisition of virtue, for that is its proper fruit. (74) On which account some of the ancients have compared the discussion and consideration of philosophy to a field, and have likened the physical portion of it to the plants, the logical part to the hedges and fences, the moral part to the fruit, (75) thinking that the walls which are built around for the sake of protecting the fruit have been erected by the possessors of the land, and that the plants have been created for the sake of the production of fruit; thus, therefore, they said that in philosophy it is requisite for the consideration of the physical and the logical part of philosophy to be referred to the moral part, by which the moral character is improved, which as a desire at the same time for both the acquisition and the use of virtue. (76) This is the lesson which we have been taught concerning the man who in word indeed had his name changed, but who in reality changed his nature from the consideration of natural to that of moral philosophy, and who abandoned the contemplation of the world itself for the knowledge of the Being who created the world; by which knowledge he acquired piety, the most excellent of all possessions.