It is a beautiful and delightful sight to behold the body of the Moon.

I think that in the discussion of natural problems we ought to begin not with the Scriptures, but with experiments and demonstrations.

By denying scientific principles, one may maintain any paradox.

The sun, with all he planets revolving around it, and depending on it, can still ripen a bunch of grapes as though 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.

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 misery!])...

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.

Surely it is a great thing to increase the numerous host of fixed stars previously visible to the unaided vision, adding countless more which have never before been seen, exposing these plainly to the eye...

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

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 scrittori, i quali se vedute l’avessero,...

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.

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.

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.

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

Philosophy [nature] is written in that great book which ever is before our eyes — I mean the universe — but we cannot understand it if we do not first learn the language and grasp...