For years I've been stressing with regard to UFOs that extraordinary claims require extraordinary evidence.
Carl SaganIt is the tension between creativity and skepticism that has produced the stunning and unexpected findings of science.
Carl SaganThere are many hypotheses in science which are wrong. Thatโs perfectly all right: itโs the aperture to finding out whatโs right. Science is a self-correcting process.
Carl SaganIf you are only skeptical, then no new ideas make it through to you. You become a crotchety old person convinced that nonsense is ruling the world. (There is, of course, much data to support you.) But every now and then, a new idea turns out to be on the mark, valid and wonderful. If you are too much in the habit of being skeptical about everything, you are going to miss or resent it, and either way you will be standing in the way of understanding and progress.
Carl Sagan