人总是比他已做的更多；他也是他能做的。

Sustainability is not just about protecting the environment, it's about creating a system that works for everyone.

数学思想的真正考验是它能否激发进一步的思考。

I'm sick of it as well. But I'm sick of not doing anything about it.

你必须准备好受苦并享受痛苦。