Nature uses only the longest threads to weave her patterns, so that each small piece of her fabric reveals the organization of the entire tapestry.

There is enough energy in a single cubic meter of space to boil all the oceans in the world.

That is the logical tight-rope on which we have to walk if we wish to interpret nature.

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

We cannot define anything precisely. If we attempt to, we get into the paralysis of thought that comes to philosophers, who sit opposite each other, one saying to the other, "You don't know what you are talking about!" The second one says, "What do you mean by know? What do you mean by talking? What do you mean by you?"

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

People who wish to analyze nature without using mathematics must settle for a reduced understanding.