You might say that the very best that can happen is to have energetic opponents.

Let me put it more precisely: The ability to give birth is a natural characteristic. In the same way, everybody can grasp philosophical truths if they just use their innate reason.

Over the entrance to the temple at Delphi was a famous inscription: KNOW THYSELF! It reminded visitors that man must never believe himself to be more than mortal - and that no man can escape his destiny.

And although I have seen nothing but black crows in my life, it doesn't mean that there's no such thing as a white crow. Both for a philosopher and for a scientist it can be important not to reject the possibility of finding a white crow. You might almost say that hunting for 'the white crow' is science's principal task.

Although you may not stumble across a Martian in the garden, you might stumble across yourself. The day that happens, you'll probably also scream a little. And that'll be perfectly all right, because it's not every day you realize you're a living planet dweller on a little island in the universe.

Perhaps the clock hands had become so tired of going in the same direction year after year that they had suddenly begun to go the opposite way instead.

But all fairytales have rules, and perhaps it’s their rules that actually distinguish one fairytale from the other. These rules never need to be understood. They only need to be followed. If not, what they promise won’t come true.