We should be open-minded, but not so open-minded that our brain falls out. - Richard Dawkins

It is normally possible to be much more certain who your children are than who your brothers are. And you can be more certain still who you yourself are!

Replicators are no longer peppered freely through the sea; they are packaged in huge colonies—individual bodies. And phenotypic consequences, instead of being evenly distributed throughout the world, have in many cases congealed into those same bodies. But the individual body, so familiar to us on our planet, did not have to exist. The only kind of entity that has to exist in order for life to arise, anywhere in the universe, is the immortal replicator.

In George Bernard Shaw’s words, ‘The fact that a believer is happier than a skeptic is no more to the point than the fact that a drunken man is happier than a sober one.