The mathematician does not study pure mathematics because it is useful; he studies it because he delights in it and he delights in it because it is beautiful.
我不缺乏把一个想法彻底思考下去的勇气,到目前为止,我还没有遇到过我害怕的想法。
A man of genius makes no mistakes. His errors are volitional and are the portals of discovery.
Being enthusiastic is worth 25 IQ points.