The Republic by Plato Part 4 Page 83

higher, lower, and middle notes of the scale, and the intermediate intervals — when he has bound all these together, and is no longer many, but has become one entirely temperate and perfectly adjusted nature, then he proceeds to act, if he has to act, whether in a matter of property, or in the treatment of the body, or in some affair of politics or private business; always thinking and calling that which preserves and co-operates with this harmonious condition, just and good action, and the knowledge which presides over it, wisdom, and that which at any time impairs this condition, he will call unjust action, and the opinion which presides over it ignorance.

You have said the exact truth, Socrates.

Very good; and if we were to affirm that we had discovered the just man and the just