I sat thinking how terribly sad it was that people are made in such a way that they get used to something as incredible as living. One day we suddenly take the fact that we exist for granted - and then, yes, then we don’t think about it anymore until we are about to leave the world again.

I wrote Sophies World in three months, but I was only writing and sleeping. I work for 14 hours a day when Im working on a book.

The rearing of children is considered too important to be left to the individual and should be the responsibility of the state.

The universe is a great mystery.

There are five billion people living on this planet. But you fall in love with one particular person, and you won't swap her for any other.

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.

I have gone around observing your activities from the outside. Because of this I have also been able to see things to which you have been blind... Every morning you have gone to work, but you have never been fully awake. Of course, you have seen the sun and the moon, the stars in the sky, and everything that moves, but you haven't really seen it at all. It is different for the Joker, because he was put into this world with a flaw: He sees too clearly and too much.