"Who is more humble? The scientist who looks at the universe with an open mind and accepts whatever the universe has to teach us, or somebody who says everything in this book must be considered the literal truth and never mind the fallibility of all the human beings involved?"
"A celibate clergy is an especially good idea, because it tends to suppress any hereditary propensity toward fanaticism."
"La prueba de ausencia no es prueba de ausencia"
"You can get into a habit of thought in which you enjoy making fun of all those other people who don't see things as clearly as you do. We have to guard carefully against it."
"Science is a way of thinking much more than it is a body of knowledge."
"We've arranged a civilization in which most crucial elements profoundly depend on science and technology. We have also arranged things so that almost no one understands science and technology. This is a prescription for disaster."