I've loved the stars too fondly to be fearful of the night.
I have never met a man so ignorant that I couldn't learn something from him.
Eppur si muove.
The Bible shows the way to go to heaven, not the way the heavens go.
Passion is the genesis of genius.
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.
You cannot teach a man anything; you can only help him discover it in himself.
There are those who reason well, but they are greatly outnumbered by those who reason badly.
All truths are easy to understand once they are discovered; the point is to discover them.
Where the senses fail us, reason must step in.
The Sun, with all the 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.
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.
Nature is relentless and unchangeable, and it is indifferent as to whether its hidden reasons and actions are understandable to man or not.
I think that in the discussion of natural problems we ought to begin not with the Scriptures, but with experiments, and demonstrations.
We cannot teach people anything; we can only help them discover it within themselves.
It is surely harmful to souls to make it a heresy to believe what is proved.
The Milky Way is nothing else but a mass of innumerable stars planted together in clusters.
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.
We must say that there are as many squares as there are numbers.
In questions of science, the authority of a thousand is not worth the humble reasoning of a single individual.
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.
Measure what is measurable, and make measurable what is not so.
If I were again beginning my studies, I would follow the advice of Plato and start with mathematics.