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

I would rather have questions that can't be answered than answers that can't be questioned.

Rule No. 1: Never lose money. Rule No. 2: Never forget Rule No. 1.

-- Warren Buffett

An expert is a man who has made all the mistakes which can be made, in a narrow field.

-- Niels Bohr

A new scientific truth does not triumph by convincing its opponents, but rather because its opponents eventually die and a new generation grows up familiar with it.

-- Max Planck

Finally we shall place the Sun himself at the center of the Universe.

-- Nicolaus Copernicus

The present is theirs; the future, for which I really worked, is mine.

-- Nikola Tesla

Mathematics is the alphabet in which God has written the universe.

-- Galileo Galilei