知识的真正方法是实验。
伦理学是对什么是善的一般性探究。
宇宙的周期性变化源于爱和争斗的相互支配。
I’ve had to learn to fight all my life—got to learn to keep smiling. If you smile, things will work out.
A pessimist sees the difficulty in every opportunity; an optimist sees the opportunity in every difficulty.