Every painting is a failure in some way, but that's what keeps you going.

Twenty years from now, you will be more disappointed by the things you didn’t do than the ones you did.So throw off the bowlines. Sail away from the safe harbor. Catch the trade winds in your sails. Explore. Dream. Discover. （注：这句说话被部分人质疑不是由马克·吐温所说的。）

To be African is to be modern - this is the central paradox we must embrace.

The best mathematics is not just logical; it is intuitive and creative, blending rigor with imagination.

There is a stubbornness about me that never can bear to be frightened at the will of others. My courage always rises at every attempt to intimidate me.