The study of mathematics is like air or gravity—it is everywhere, and you can't see it, but you know it's there.

忠于自己，永远不要为任何人牺牲自己。

Truth is always stranger than fiction, because fiction has to make sense, while truth doesn't.

每个故事都有一个结局，但在生活中，每个结局都只是一个新的开始。

"The world is a book, and those who do not travel read only one page."

逻辑学研究不仅仅是关于形式系统，更是关于人类推理的本质。