The total amount of suffering per year in the natural world is beyond all decent contemplation. During the minute that it takes me to compose this sentence, thousands of animals are being eaten alive, many others are running for their lives, whimpering with fear, others are slowly being devoured from within by rasping parasites, thousands of all kinds are dying of starvation, thirst, and disease.

The only way to do great work is to love what you do.

I don't know what I'm going to do next, but I'm excited about it.

I have already carried out my duty. I have proved the Poincaré conjecture and I have nothing more to do in mathematics.