Learn from yesterday, live for today, hope for tomorrow. The important thing is not to stop questioning.
Politics is for the present, but an equation is for eternity.
It's not that I'm so smart, it's just that I stay with problems longer.
Don't do anything that goes against your conscience, even if your country says so.
Don't listen to their words, fix your attention on their deeds.
[Mystery] is the fundamental emotion that stands at the cradle of true art and true science.