The best way to have a good idea is to have lots of ideas.

I have always been delighted at the prospect of a new day, a fresh try, one more start.

An experiment is a question which science poses to Nature, and a measurement is the recording of Nature's answer.

-- Max Planck

I frame no hypotheses.

-- Isaac Newton

The seeker after truth is not one who studies the writings of the ancients and, following his natural disposition, puts his trust in them, but rather the one who suspects his faith in them and questions what he gathers from them.

-- Ibn al-Haytham

Measure what is measurable, and make measurable what is not so.

-- Galileo Galilei

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

-- Richard Feynman

The knowledge of anything, since all things have causes, is not acquired or complete unless it is known by its causes.

-- Avicenna