“I should like to say two things, one intellectual and one moral.
“The intellectual thing I should want to say to them is this: 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. That is the intellectual thing that I should wish to say.
“The moral thing I should wish to say to them is very simple: I should say, love is wise, hatred is foolish. In this world which is getting more and more closely interconnected, we have to learn to tolerate each other; we have to learn to put up with the fact that some people say things that we don’t like. We can only live together in that way — and if we are to live together and not die together, we must learn a kind of charity and a kind of tolerance, which is absolutely vital to the continuation of human life on this planet.
“What is elementary, worldly wisdom? Well, the first rule is that you can’t really know anything if you just remember isolated facts and try and bang ’em back. If the facts don’t hang together on a latticework of theory, you don’t have them in a usable form.
“You’ve got to have models in your head. And you’ve got to array your experience—both vicarious and direct—on this latticework of models. You’ ve got to hang experience on a latticework of models in your head.