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Rh with a view to a time of life when men begin to grow old, they ought to practise the gentler harmonies and melodies as well as the others. And if there be any harmony, such as the Lydian above all others appears to be, which is suited to children of tender age, and possesses the elements both of order and of education, clearly [we ought to use it, for] education should be based upon three principles—the mean, the possible, the becoming, these three.