The mathematician does not study pure mathematics because it is useful; he studies it because he delights in it and he delights in it because it is beautiful.
时间旅行是世界上最令人沮丧的事情。你无法改变任何事情，也无法阻止任何事情的发生。
Never underestimate the importance of "useless" fundamental research.
My idea of heaven is a great big baked potato and someone to share it with.
