When you are studying any matter, or considering any philosophy, ask yourself only what are the facts and what is the truth that the facts bear out. Never let yourself be diverted, either by what you wish to believe, or by what you think would have beneficent social effects if it were believed. But look only, and solely, at what are the facts.
不管你是在研究什么事物，还是在思考任何观点，只问你自己，事实是什么，以及这些事实所证实的真相是什么。永远不要让自己被自己所更愿意相信的、或者认为人们相信了，会对社会更加有益的东西所影响。只是单单地去审视，什么才是事实。
via 罗素