Quality...

Quality is never an accident; it is always the result of high intention, sincere effort, intelligent direction and skillful execution; it represents the wise choice of many alternatives.

-William Foster

Quality means doing it right when no one is looking.

-Henry Ford

Quality in a service or product is not what you put into it. It is what the client or customer gets out of it.

-Peter Drucker

Quality is inversely proportional to variability
i.e. as variation increases, product quality decreases

-Douglas C. Montgomery