I heard part of an interview with Richard Dawkins, evolutionary zoologist, on NPR’s Radio Times today. During the conversation, it came up that he had written an open letter to his daughter Juliet about 11 years ago. In that letter, he had some very interesting things to say about information security. Well, not really, but he did touch on how people believe what they believe. Here are some key excerpts:

The way scientists use evidence to learn about the world is much cleverer and more complicated than I can say in a short letter. But now I want to move on from evidence, which is a good reason for believing something , and warn you against three bad reasons for believing anything. They are called "tradition," "authority," and "revelation."

…

Inside feelings are valuable in science, too, but only for giving you ideas that you later test by looking for evidence. A scientist can have a "hunch’" about an idea that just "feels" right. In itself, this is not a good reason for believing something. But it can be a good reason for spending some time doing a particular experiment, or looking in a particular way for evidence. Scientists use inside feelings all the time to get ideas. But they are not worth anything until they are supported by evidence.

…

What can we do about all this ? It is not easy for you to do anything, because you are only ten. But you could try this. Next time somebody tells you something that sounds important, think to yourself: "Is this the kind of thing that people probably know because of evidence? Or is it the kind of thing that people only believe because of tradition, authority, or revelation?" And, next time somebody tells you that something is true, why not say to them: "What kind of evidence is there for that?" And if they can’t give you a good answer, I hope you’ll think very carefully before you believe a word they say.

Interesting indeed. And good advice, I think.