Galileo Galilei

"By denying scientific principles, one may maintain any paradox."

"Measure what can be measured, and make measurable what cannot be measured."

"By denying scientific principles, one may maintain any paradox."

"In questions of science, the authority of a thousand is not worth the humble reasoning of a single individual."

"You cannot teach a man anything, you can only help him find it within himself."

"The sun, with all those planets revolving around it and dependent on it, can still ripen a bunch of grapes as if it had nothing else in the universe to do."

"I have never met a man so ignorant that I couldn't learn something from him."