"In the silence of reading, the loudest voices of humanity can be heard."

"In the end, we will remember not the words of our enemies, but the silence of our friends."

Science is a journey, not a destination.

I prefer liberty with danger to peace with slavery.

Children have real understanding only of that which they invent themselves, and each time that we try to teach them something too quickly, we keep them from reinventing it themselves.

当遇到反对意见时，即使它可能来自你的丈夫或孩子，也要努力用论证而不是权威去克服它，因为依靠权威的胜利是不可靠而虚妄的。