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A subtle thought that is in error may yet give rise to fruitful inquiry that can establish truths of great value.

By doubting we come to inquiry, and by inquiry we come to truth.

I put forward formless and unresolved notions, as do those who publish doubtful questions to debate in the schools, not to establish the truth but to seek it.

It is by doubting that we come to investigate, and by investigating that we recognize the truth.

That is the essence of science: ask an impertinent question, and you are on the way to a pertinent answer.

It is not the answer that enlightens, but the question.