我这一代人最伟大的发现是，人类可以通过改变心态来改变他们的生活。
Act as if what you do makes a difference. It does.
悲观主义者是这种人：当他可以从两种罪恶中选择时，他把两种都选了。
乐观是一种可以学习的技能。
The study of formal languages and automata is essential for understanding the theoretical underpinnings of computer science.
What we think, we become.
And when your stomach is empty and your mind is full,it's always hard to sleep.