The day, water, sun, moon, night - I do not have to purchase these things with money.
That which you know, know not; and that which you see, see not.
He who seeks for gain, must be at some expense.
Even the whole of life is not sufficient for thorough learning.
Who wishes to give himself an abundance of business let him equip these two things, a ship and a woman. For no two things involve more business, if you have begun to fit them out. Nor are these two things ever sufficiently adorned, nor is any excess of adornment enough for them.
Courage is to take hard knocks like a man when occasion calls.