Bronowski expresses this perfectly. Ideas must be open to challenge. Certainty must be tested. Suppressing free thought and inquiry allows the unthinkable to happen.
Reposted from Humanists UK
'Into this pond were flushed the ashes of some four million people. And that was not done by gas. It was done by arrogance, it was done by dogma, it was done by ignorance. When people believe that they have absolute knowledge, with no test in reality, this is how they behave.' #HMD

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