“I do not feel obliged to believe that the same God who has endowed us ...” — Galileo Galilei Quote

“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.”

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

“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.”

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

“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.”

“People say we are playing God. My answer is: If”

“I liked numbers because they were solid, invariant; they stood unmoved in a chaotic world.”

“Wonder is the seed of knowledge”

“He is so old that his blood type was discontinued.”

“I took classes taught by an elderly woman who wrote children's stories. She was polite about the science fiction and fantasy that I kept handing in, but she finally asked in exasperation, 'Can't you write anything normal?'”

“The theologian Meric Casaubon argued—in his 1668 book, Of Credulity and Incredulity—that witches must exist because, after all, everyone believes in them. Anything that a large number of people believe must be true.”