If I can't picture it, I can't understand it.

I think 99 times and find nothing. I stop thinking, swim in the silence, and the truth comes to me.

To the Master's honor all must turn, each in its track, without a sound, forever tracing Newton's ground.

The thing is, not to stop questioning.

We should be on our guard not to overestimate science and scientific methods when it is a question of human problems, and we should not assume that experts are the only ones who have the right to express themselves on questions affecting the organization of society.

Our entire much-praised technological progress, and civilization generally, could be compared to an axe in the hand of a pathological criminal.

Imagination without knowledge may create beautiful things, knowledge without imagination can create only perfect ones.