[19]
But many self-styled lovers of wisdom may reply: A just man can never become unjust; a prudent man can never become wanton; in fact no one having learned any kind of knowledge can become ignorant of it. I do not hold with this view.1 I notice that as those who do not train the body cannot perform the functions proper to the body, so those who do not train the soul cannot perform the functions of the soul: for they cannot do what they ought to do nor avoid what they ought not to do.
1 Cyropaedia VII. v. 75. Against Antisthenes.
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