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The essence of the Liberal outlook lies not in what opinions are held, but in how they are held: instead of being held dogmatically, they are held tentatively, and with a consciousness that new evidence may at any moment lead to their abandonment.

自由主义观点的本质不在于人们持有什么样的观点，而在于人们如何持有这些观点:人们不是武断地持有这些观点，而是试探性地持有这些观点，并意识到新的证据随时可能导致人们抛弃这些观点。

— Bertrand Russell 罗素