The father in case is Richard Dawkins and the letter is here. A beautiful one indeed. The most valuable piece of advice a daughter can get from a father.
One of the snippets:
I want to try to explain why tradition is so important to us. All animals are built (by the process called evolution) to survive in the normal place in which their kind live. Lions are built to be good at surviving on the plains of Africa. Crayfish to be good at surviving in fresh, water, while lobsters are built to be good at surviving in the salt sea. People are animals, too, and we are built to be good at surviving in a world full of ….. other people. Most of us don’t hunt for our own food like lions or lobsters; we buy it from other people who have bought it from yet other people. We ”swim” through a “sea of people.” Just as a fish needs gills to survive in water, people need brains that make them able to deal with other people. Just as the sea is full of salt water, the sea of people is full of difficult things to learn. Like language.
You speak English, but your friend Ann-Kathrin speaks German. You each speak the language that fits you to ‘`swim about” in your own separate “people sea.” Language is passed down by tradition. There is no other way . In England, Pepe is a dog. In Germany he is ein Hund. Neither of these words is more correct, or more true than the other. Both are simply handed down. In order to be good at “swimming about in their people sea,” children have to learn the language of their own country, and lots of other things about their own people; and this means that they have to absorb, like blotting paper, an enormous amount of traditional information. (Remember that traditional information just means things that are handed down from grandparents to parents to children.) The child’s brain has to be a sucker for traditional information. And the child can’t be expected to sort out good and useful traditional information, like the words of a language, from bad or silly traditional information, like believing in witches and devils and ever-living virgins.
It’s a pity, but it can’t help being the case, that because children have to be suckers for traditional information, they are likely to believe anything the grown-ups tell them, whether true or false, right or wrong. Lots of what the grown-ups tell them is true and based on evidence, or at least sensible. But if some of it is false, silly, or even wicked, there is nothing to stop the children believing that, too. Now, when the children grow up, what do they do? Well, of course, they tell it to the next generation of children. So, once something gets itself strongly believed – even if it is completely untrue and there never was any reason to believe it in the first place – it can go on forever.