This has been done elegantly by Minkowski; but chalk is cheaper than grey matter, and we will do it as it comes.

The most important thing is to not stop questioning.

Experience is knowledge. All the rest is information.

The facts, although interesting, are irrelevant.

One must console oneself with the thought that time has a sieve through which most of these important things run into the ocean of oblivion and what remains after this selection is often still trite and bad.

A tyranny based on ... deception and maintained by terror must inevitably perish from the poison it generates within itself.

Paper is to write things down that we need to remember. Our brains are used to think.