永远不要问理发师你是否需要理发。
Never ask a barber if you need a haircut.
The boundary between physics and mathematics is not as clear-cut as we might think.
Leadership is about making the tough decisions and standing by them.
自由比平等重要。实现平等的企图危及了自由。如果失去了自由，就连在不自由的人中间也不会有平等。
译文：地位逐渐上升内心就要更谦卑，官位提高就要更加小心行事。赏析：当我们的名声和地位逐渐提高时，要低调谦虚，宽以待人，要防止身边的小人报复自己。
自由的目的是为了解放他人。