The qualities of character can be arranged in triads, in each of which the first and last qualities will be extremes and vices, and the middle qualit… - Will Durant

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The qualities of character can be arranged in triads, in each of which the first and last qualities will be extremes and vices, and the middle quality a virtue or an excellence. So between cowardice and rashness is courage; between stinginess and extravagance is liberality; between sloth and greed is ambition; between humility and pride is modesty; between secrecy and loquacity, honesty; between moroseness and buffoonery, good humor; between quarrelsomeness and flattery, friendship; between Hamlet’s indecisiveness and Quixote’s impulsiveness is self-control.49 “Right,” then, in ethics or conduct, is not different from “right” in mathematics or engineering; it means correct, fit, what works best to the best result.