The study of mathematics is like air or gravity—it is everywhere, and you can't see it, but you know it's there.
The only way to do great work is to love what you do.
The true teacher defends his pupils against his own personal influence. He inspires self-distrust. He guides their eyes from himself to the spirit that quickens him. He will have no disciple.
殖民地代表着一个新人类计划将被测试的场所。
能源独立不仅仅是一个目标；它是国家安全的必需品。
The consequences of an act affect the probability of its occurring again.