The question of whether a thing is right or wrong, good or bad, must always be considered in relation to a persons needs.

But understanding will always require some effort. You probably wouldn't admire a friend who was good at everything if it cost her no effort.

A philosopher knows that in reality he knows very little. That is why he constantly strives to achieve true insight. Socrates was one of these rare people. He knew that he knew nothing about life and about the world. And now comes the important part: it troubled him that he knew so little.

When we sense something, it is due to the movement of atoms in space. When I see the moon it is because "moon atoms" penetrate my eye.

Many of the Nazis were convicted after the war, but they were not convicted for being 'unreasonable'. They were convicted for being gruesome murderers.

A hydrogen atom in a cell at the end of my nose was once part of an elephant's trunk. A carbon atom in my cardiac muscle was once in the tail of a dinosaur.

I've nothing against eye make-up and lipstick. But the fact is that we’re actually living on a planet in space. For me that’s an extraordinary thought. It’s mind-boggling just to think about the existence of space at all. But there are girls who can’t see the universe for eye liner.