Somewhere, something incredible is waiting to be known. - Carl Sagan

"There are no forbidden questions in science, no matters too sensitive or delicate to be probed, no sacred truths."

"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."

"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?"

"The nuclear arms race is like two sworn enemies standing waist deep in gasoline, one with three matches, the other with five."

"I consider it an extremely dangerous doctrine, because the more likely we are to assume that the solution comes from the outside, the less likely we are to solve our problems ourselves."