Be brave enough to be bad at something new.
I'm a strong believer in karma.
The history of science is the history of men correcting their mistakes.
数学思想的真正考验是它能否激发进一步的思考。
一件事情都不能做到有始有终，就不要去操持其他的事情；一物也不明白，就不要追求博闻广记。