In our personal ambitions we are individualists. But in our seeking for economic and political progress as a nation, we all go up or else all go down as one people.

Fix reason firmly in her seat, and call to her tribunal every fact, every opinion. Question with boldness even the existence of a God; because, if there be one, he must more approve of the homage of reason, than that of blindfolded fear.

Vocations which we wanted to pursue, but didn't, bleed, like colors, on the whole of our existence.

All intelligent thoughts have already been thought; what is necessary is only to try to think them again.

There happen to be a lot of people around who spent an hour on the Internet and think they know a lot of physics, but it doesn't work like that... There's a reason there are graduate schools in these departments.