"He defined me first, as parents do. Those early characterizations can become the shimmering self-image we embrace or the limited, stifling perception we rail against for a lifetime."

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One of the reasons for its success is that science has a built-in, error-correcting machinery at its very heart. Some may consider this an overbroad characterization, but to me every time we exercise self-criticism, every time we test our ideas against the outside world, we are doing science. When we are self-indulgent and uncritical, when we confuse hopes and facts, we slide into pseudoscience and superstition.

— Carl Sagan