"It is difficult to walk at one and the same time on a single path and on many."

"Time is the soul of this world."

"Rest satisfied with doing well, and leave others to talk of you as they please."

"No one is free who has not obtained the empire of himself. No man is free who cannot command himself."

"The square of the hypotenuse of a right-angled triangle is equal to the sum of the squares of the other two sides."