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Now the support and stay of that unswerving constancy, which we look for in friendship, is loyalty; for nothing is constant that is disloyal. Moreover, the right course is to choose for a friend one who is frank, sociable, and sympathetic—that is, one who is likely to be influenced by the same motives as yourself—since all these qualities conduce to loyalty; for it is impossible for a man to be loyal whose nature is full of twists and twiningsCf. De nat. deor. ii. 54. 136 alvus multiplex et tortuosa. ; and, indeed, one who is untouched by the same influences as yourself and is naturally unsympathetic cannot be either loyal or steadfast. To this observation should be added a requirement tending to produce that steadfastness, which I have been discussing for some time: a friend must neither take pleasure in bringing charges against you nor believe them when made by others. And so, the truth of what I said in the beginning is established: Friendship cannot exist except among good men.Supra, § 18.
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For it is characteristic of the good man, whom I may also call the wise man, to maintain these two rules in friendship: first, let there be no feigning or hypocrisy; for it is more befitting a candid man to hate openly than to mask his real thoughts with a lying face; secondly, let him not only reject charges preferred by another, but also let him avoid even being suspicious and ever believing that his friend has done something wrong.