The whole problem with the world is that fools and fanatics are always so certain of themselves， and wiser people so full of doubts.
世界的整個問題在于愚蠢的人和狂熱分子總是對自己如此確定，而聰明的人則充滿疑慮。
不要詆毀眾人的成就而歸功于自己，不要埋沒天下的事理以掩飾自己的過失。
Mathematics is not about numbers, equations, computations, or algorithms: it is about understanding.