悲觀主義者是這種人:當他可以從兩種罪惡中選擇時,他把兩種都選了。
世界是一本書,不旅行的人只讀了一頁。
You have to believe in yourself when no one else does.
The true test of a mathematical idea is its ability to inspire further thought.
最好的領導方式是真實。