Then Agar, who is the middle kind of encyclical instruction, even if she should endeavour to escape from the austere and stern life of the lovers of virtue, will again return to it, since it is not, as yet, able to receive the generic and imperishable excellencies of virtue, but can only touch the particular virtues, and such as are spoken of in species, in which it is sufficient to attain to mediocrity instead of extreme perfection.
 But when Abram, instead of an inquirer into natural philosophy, became a wise man and a lover of God, having his name changed to Abraham, which being interpreted means
 Genesis xvi. 9. 
 Genesis xxi. 14. 
 
the great father of sounds; for language when uttered sounds, and the father of language is the mind, which has attained to what is virtuous. And when Sarai instead of being my authority, had her name also changed to Sarah, the meaning of which is princess, and this change is equivalent to becoming generic and imperishable virtue, instead of virtue special and perishable: then will arise the genus of happiness that is to say, Isaac; and he, when all the feminine affections The Greek text here is corrupt and unintelligible. I have followed the Latin translation of Mangey. have ceased, and when the passion of joy and cheerfulness are dead, will eagerly pursue, not childish amusements, but divine objects; then too those elementary branches of instruction which bear the name of Agar, will be cast out, and their sophistical child will also be cast out, who is named Ishmael.
 And they shall undergo eternal banishment, God himself confirming their expulsion, when he bids the wise man obey the word spoken by Sarah, and she urges him expressly to cast out the serving woman and her son; and it is good to be guided by virtue, and especially so when it teaches such lessons as this, that the most perfect natures are very greatly different from the mediocre habits, and that wisdom is a wholly different thing from sophistry; for the one labours to devise what is persuasive for the establishment of a false opinion, which is pernicious to the soul, but wisdom, with long meditation on the truth by the knowledge of right reason, brings real advantage to the intellect. Why then do we wonder if God once for all banished Adam, that is to say, the mind out of the district of the virtues, after he had once contracted folly, that incurable disease, and if he never permitted him again to return, when he also drives out and banishes from wisdom and from the wise man every sophist, and the mother of sophists, the teaching that is of elementary instruction, while he calls the names of wisdom and of the wise man Abraham, and Sarah.