Richard Feynman

Understanding is more important than memorizing.

Don't worry about saving the world; just make the world a better place.

Be generous with your time and knowledge.

The joy of discovery is the greatest reward.

Keep your sense of humor.

Cancer is a word, not a sentence.

I'll fight it as long as I can.

Death is certain, but life is not.

I would not leave this world without knowing if there is life after death.

The universe is full of mysteries.

Keep exploring.

The first principle is that you must not fool yourself—and you are the easiest person to fool.

I learned very early the difference between knowing the name of something and knowing something.

If you thought that science was certain—well, that is just an error on your part.

The imagination of nature is far, far greater than the imagination of man.

I would rather have a mind opened by wonder than one closed by belief.

The world is a dynamic mess of jiggling things.

There is plenty of room at the bottom.

The thing that doesn't fit is the most interesting.

To every man is given the key to the gates of heaven; the same key opens the gates of hell.