Man is the only animal for whom his own existence is a problem which he has to solve.

There's nothing that makes you so aware of the improvisation of human existence as a song unfinished. Or an old address book.

Existence really is an imperfect tense that never becomes a present.

There's a time when you have to explain to your children why they're born, and it's a marvelous thing if you know the reason by then.

Existence is no more than the precarious attainment of relevance in an intensely mobile flux of past, present, and future.

I can, therefore I am.