Live as if you were to die tomorrow. Learn as if you were to live forever.

Life is like riding a bicycle. To keep your balance you must keep moving.

You should be the change that you want to see in the world.

You have enemies? Good. That means you've stood up for something, sometime in your life.

Not everything that counts can be counted, and not everything that can be counted counts. This was on a sign hanging in Einstein's office at Princeton, which is often quoted as a statement by him; research should be able to reveal whether or not it originated with Einstein.

It does not matter how slowly you go so long as you do not stop.

A person starts to live when he can live outside himself.