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Conduct yourself toward your parents as you would have your children conduct themselves toward you.1Train your body, not by the exercises which conduce to strength, but by those which conduce to health. In this you will succeed if you cease your exertions while you still have energy to exert yourself.
1 Isocrates anticipates the golden rule.Cf. Isoc. 3.61; Isoc. 2.24, 38; Isoc. 4.81.