"Those [scientists] who dislike entertaining contradictory thoughts are unlikely to enrich their science with new ideas."

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I make one image—though 'make' is not the right word; I let, perhaps, an image be 'made' emotionally in me and then apply to it what intellectual & critical forces I possess—let it breed another, let that image contradict the first, make, of the third image bred out of the other two together, a fourth contradictory image, and let them all, within my imposed formal limits, conflict.

— Dylan Thomas