What is not surrounded by uncertainty cannot be the truth.

If you think you understand quantum mechanics, you don't understand quantum mechanics.

The game I play is a very interesting one. It's imagination in a straightjacket, which is this: that it has to agree with the known laws of physics. ... It requires imagination to think of what's possible, and then it requires an analysis back, checking to see whether it fits, whether its allowed, according to what's known, okay?

To test whether you have learned an idea or a definition, rephrase what you just learned without using the new word.

The truth always turns out to be simpler than you thought.

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

I think a power to do something is of value. Whether the result is a good thing or a bad thing depends on how it is used, but the power is a value.