There are no forbidden questions in science, no matters too... - Carl Sagan

"We can't help it. Life looks for life."

"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."

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

"A celibate clergy is an especially good idea, because it tends to suppress any hereditary propensity toward fanaticism."

"You could just as well say that an agnostic is a deeply religious person with at least a rudimentary knowledge of human fallibility."