Carl Sagan on Skepticism

If we teach school children the habit of being skeptical perhaps they will not restrict their skepticism to aspirin commercials and 35,000 year old channelers. Maybe they will start asking awkward questions about economic or social or political or religious institutions, and then where will we be?

Skepticism is dangerous. In fact, it is the business of skepticism to be dangerous. That is exactly its function…It seems to me what is called for is an exquisite balance between two conflicting needs: the most skeptical scrutiny of all hypotheses that are served up to us and at the same time a great openness to new ideas.

If you are only skeptical, then no new ideas make it through to you. You never learn anything new. You become a crotchety old person convinced that nonsense is ruling the world. (There is, of course, much data to support you.)

On the other hand, if you are open to the point of gullibility and have not an ounce of skeptical sense in you, then you cannot distinguish the useful ideas from the worthless ones.

If all ideas have equal validity then you are lost, because then, it seems to me, no ideas have any validity at all.