What did you ASK at school today?

I don't know what's the matter with people: they don't learn by understanding, they learn by some other way — by rote or something. Their knowledge is so fragile!

We are not to tell nature what she’s gotta be... She's always got better imagination than we have.

Teach principles not formulas.

Strange! I don't understand how it is that we can write mathematical expressions and calculate what the thing is going to do without being able to picture it.

A scientist is never certain. ... We absolutely must leave room for doubt or there is no progress and there is no learning.

Agnostic for me would be trying to weasel out and sound a little nicer than I am about this.