It is hard to contend against one's heart's desire; for whatever it wishes to have it buys at the cost of soul.
All things come into being by conflict of opposites.
War is the father and king of all.
The fairest harmony springs from discord.
Those who hear and do not understand are like the deaf. Of them the proverb says: "Present, they are absent."
It is weariness to keep toiling at the same things so that one becomes ruled by them.