Book 3
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The third class relates to the faculty of assent and to what is plausible and persuasive. As Socrates said that we are not to lead a life which is not tested, so neither are we to admit an untested semblance; but to say, Stop, let me see what you are and whence you come, just as the police say, Show me your pass. Have you that indorsement from Nature which is necessary to the acceptance of every semblance?
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In short, whatever things are applied to the body by those who train it, so may these be used in our training if they any way affect desire or aversion. But if this be done for mere ostentation, it belongs to one who looks and seeks for something external, and strives for spectators to exclaim, What a great man! Hence Apollonius said well, If you have a mind to train yourself for your own benefit, when you are choking with heat, take a little cold water in your mouth, and spit it out again, and hold your tongue.
What solitude is; and what a solitary person.