罗素在就给未来世界的留言中说过，
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.
当你在研究任何事物，或思考任何哲理时，只问自己事实是什么，由事实证明的真相又是什么。
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.
永远不要让你本人被自己更愿意相信的，或者认为人们相信了就会对社会更有益的东西所影响。
But look only, and solely, at what are the facts. That is the intellectual thing that I should wish to say.
只是纯粹的观察，究竟事实是什么。这就是我想说的有关智慧的事情。