Freedom is not a gift, but a right that must be fought for.

I don’t let anyone else’s opinion define my worth.

数学不是关于数字、方程、计算或算法的：它是关于理解的。

Hope is a scarce resource in poor communities.

"To be Irish is to know that in the end the world will break your heart."

The proper function of man is to live，not to exist.

Every moment of one's existence one is growing into more or retreating into less.

人活着只有两件事，忙着活，忙着死。