I do not think it is necessary to believe that the same God who has given us our senses, reason, and intelligence wished us to abandon their use, giving us by some other means the information that we could gain through them.
Facts which at first seem improbable will, even on scant explanation, drop the cloak which has hidden them and stand forth in naked and simple beauty.
By denying scientific principles, one may maintain any paradox.
The Bible shows the way to go to heaven, not the way the heavens go.
To command their professors of astronomy to refute their own observations is to command them not to see what they do see and not to understand what they do understand.
It is surely harmful to souls to make it a heresy to believe what is proved.
Knowing thyself, that is the greatest wisdom.
You cannot teach a person something he does not already know, you can only bring what he does know to his awareness.
I truly believe the book of philosophy to be that which stands perpetually open before our eyes, though since it is written in characters different from those of our alphabet it cannot be read by everyone.
Nature’s great book is written in mathematics.
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 we laugh, or shall we cry?
One can understand nature only when one has learned the language and the signs in which it speaks to us; but this language is mathematics and these signs are methematical figures.
It was granted to me alone to discover all the new phenomena in the sky and nothing to anybody else. This is the truth which neither envy nor malice can supress.
Well, since paradoxes are at hand, let us see how it might be demonstrated that in a finite continuous extension it is not impossible for infinitely many voids to be found.
What has philosophy got to do with measuring anything? It’s the mathematicians you have to trust, and they measure the skies like we measure a field.
I think that in the discussion of natural problems we ought to begin not with the Scriptures, but with experiments, and demonstrations.
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.
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.
Holy Writ was intended to teach men how to go to Heaven not how the heavens go.
Mathematics is the key and door to the sciences.