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Doubt grows with knowledge.

If necessity is the mother of invention, it's the father of cooperation. And we're cooperating like never before.

Necessity may be the mother of invention, but play is certainly the father.

In other words, what is supposedly found is an invention whose inventor is unaware of his act of invention, who considers it as something that exists independently of him; the invention then becomes the basis of his world view and actions.

Wonder rather than doubt is the root of all knowledge.

We are quite at ease in this no man's land of ignorance and doubt and dispute, absorbed in the ambiguities of trying to reach truth by mixing fact with invention.

Doubt is part of all religion. All the religious thinkers were doubters.