I always cheer up immensely if an attack is particularly wounding because I think, well, if they attack one personally, it means they have not a single political argument left.

Don't let the noise of others' opinions drown out your own inner voice.

The worst blindness is the blindness of those who do not want to see.

The unity of mathematics is not an illusion but a reality waiting to be uncovered.

可持续性不是一种选择；而是我们对后代的责任。