Sustainability isn't a cost; it's an investment in relevance and longevity.

The only way to avoid being miserable is not to have enough leisure to wonder whether you are happy or not.

"The best stories are those that leave room for the reader’s imagination."

I don’t let failure define me, I let it refine me.

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