"My dear Kepler, what would you say of the learned here, who, replete with the pertinacity of the asp, have steadfastly refused to cast a glance through the telescope? What shall we make of this? Shall…"

"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."

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

"The purpose of science is not to open the door to infinite wisdom, but to set a limit to infinite error."

"It is necessary to examine the actual structure of the universe, and not to cling to old ideas."