You don't write because you want to say something, you write because you have something to say.

The poetry of the earth is never dead.

You think you know when you can learn, are more sure when you can write, even more when you can teach, but certain when you can program.

Quality is more important than quantity. One home run is much better than two doubles.

The supreme quality for leadership is unquestionably integrity. Without it， no real success is possible， no matter whether it is on a section gang， a football field， in an army， or in an office.

The key to progress is persistence and a willingness to challenge conventional wisdom.

每个数学问题都有一个解决方案；只是需要时间和努力去找到它。