数学思想的真正考验是它能否激发进一步的思考。

I’m not going to change who I am or what I stand for just because it’s not popular with everyone.

Pain is not always physical; sometimes the deepest wounds are the ones we cannot see.

全球金融危机是现代历史上最严重的危机，需要采取非同寻常的应对措施。