Rhythm and melody enter into the soul of the well-instructed youth and produce there a certain mental harmony hardly obtainable in any other way. . . . thus music, too, is concerned with the principles of love in their application to harmony and rhythm.
... for this discovery of yours will create forgetfulness in the learners' souls, because they will not use their memories; they will trust to the external written characters and not remember of themselves.
The true musician is attuned to a fairer harmony than that of the lyre... for he truly has in his own life a harmony of words and deeds arranged in the Dorian mode. Such a one makes me joyous with the sound of his voice, so eager am I in drinking in his words.
Justice in the individual is now defined analogously to justice in the state. The individual is wise and brave in virtue of his reason and spirit respectively: he is disciplined when spirit and appetite are in proper subordination to reason. He is just in virtue of the harmony which exists when all three elements of the mind perform their proper function and so achieve their proper fulfillment; he is unjust when no such harmony exists.
A man who is good for anything ought not to calculate the chance of living or dying; he ought only to consider whether in doing anything he is doing right or wrong - acting the part of a good man or of a bad.