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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, ... you never learn anything new. ... On the other hand, if you are open to the point of gullibility ..., 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.
— Carl Sagan

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