Richard Dawkins letter to his daughter Juliet on good and bad reasons for believing things.
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.”
First, tradition. A few months ago, I went on television to have a discussion with about fifty children. These children were invited because they had been brought up in lots of different religions. Some had been brought up as Christians, others as Jews, Muslims, Hindus, or Sikhs. The man with the microphone went from child to child, asking them what they believed. What they said shows up exactly what I mean by “tradition.” Their beliefs turned out to have no connection with evidence. They just trotted out the beliefs of their parents and grandparents which, in turn, were not based upon evidence either. They said things like: “We Hindus believe so and so”; “We Muslims believe such and such”; “We Christians believe something else.”
Of course, since they all believed different things, they couldn’t all be right. The man with the microphone seemed to think this quite right and proper, and he didn’t even try to get them to argue out their differences with each other. But that isn’t the point I want to make for the moment. I simply want to ask where their beliefs come from. They came from tradition. Tradition means beliefs handed down from grandparent to parent to child, and so on. Or from books handed down through the centuries. Traditional beliefs often start from almost nothing; perhaps somebody just makes them up originally, like the stories about Thor and Zeus. But after they’ve been handed down over some centuries, the mere fact that they are so old makes them seem special. People believe things simply because people have believed the same thing over the centuries. That’s tradition.
The trouble with tradition is that, no matter how long ago a story was made up, it is still exactly as true or untrue as the original story was. If you make up a story that isn’t true, handing it down over a number of centuries doesn’t make it any truer!