You cannot teach a man anything; you can only help him find it within himself.
I have never met a man so ignorant that I couldn't learn something from him.
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.
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.
In questions of science, the authority of a thousand is not worth the humble reasoning of a single individual.
Doubt is the father of invention.
I think that in the discussion of natural problems we ought to begin not with the Scriptures, but with experiments, and demonstrations.
In my opinion, nothing occurs contrary to nature except the impossible, and that never occurs.
It is surely harmful to souls to make it a heresy to believe what is proved.