When it was suggested to ...

When it was suggested to Pasteur that many of his great achievements depended on luck, he replied - I'm sure with more than a little irritation - 'In the field of observation in science, fortune only favours the prepared mind.' It is not by chance that it is always the great scientists who have the luck.
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 Lewis Wolpert

Quotes from the same author

Both Newton and Darwin were driven by the data and were forced to recognize that they couldn't explain everything. It may be a characteristic of great scientists to know what to accept and what to leave out.
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 Lewis Wolpert
Reliable scientific knowledge is value free and has no moral or ethical value. Science tells us how the world is. ... Dangers and ethical issue arise only when science is applied as technology.
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 Lewis Wolpert