Galileo Galilei

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

“I do not feel obliged to believe that the same God who has endowed us with sense, reason, and intellect has intended us to forgo their use.”

“I esteem myself happy to have as great an ally as you in my search for truth. I will read your work ... all the more willingly because I have for many years been a partisan of the Copernican...”

“See now the power of truth; the same experiment which at first glance seemed to show one thing, when more carefully examined, assures us of the contrary.”

“By denying scientific principles, one may maintain any paradox.”

“I do not feel obliged to believe that the same God who has endowed us with senses, reason, and intellect has intended us to forgo their use and by some other means to give us knowledge which...”

“Where the senses fail us, reason must step in.”

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

“Sì perché l'autorità dell'opinione di mille nelle scienze non val per una scintilla di ragione di un solo, sì perché le presenti osservazioni spogliano d'autorità i decreti de' passati scrit...”

“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 t...”

“Names and attributes must be accommodated to the essence of things, and not the essence to the names, since things come first and names afterwards.”

“I have been in my bed for five weeks, oppressed with weakness and other infirmities from which my age, seventy four years, permits me not to hope release. Added to this (proh dolor! [O miser...”

“(T)he increase of known truths stimulates the investigation, establishment, and growth of the arts.”

“The nature of the human mind is such that unless it is stimulated by images of things acting upon it from without, all remembrance of them passes easily away.”

“We cannot teach people anything; we can only help them discover it within themselves.”

“Who would set a limit to the mind of man? Who would dare assert that we know all there is to be known?”

“I notice that young men go to the universities in order to become doctors or philosophers or anything, so long as it is a title, and that many go in for those professions who are utterly unf...”

“The Bible shows the way to go to heaven, not the way the heavens go.”

“Philosophy is written in this grand book, the universe, which stands continually open to our gaze. But the book cannot be understood unless one first learns to comprehend the language and re...”

“It vexes me when they would constrain science by the authority of the Scriptures, and yet do not consider themselves bound to answer reason and experiment.”