Why Not Kill Yourself?

There is but one truly serious philosophical problem, and that is suicide. Judging whether life is or is not worth living amounts to answering the fundamental question of philosophy. All the rest — whether or not the world has three dimensions, whether the mind has nine or twelve categories — comes afterward. These are games; one must first answer.

-Albert Camus

I've long paraphrased this statement by saying:
"Camus' only question for philosophy is: why not kill yourself?"
He poses and answers this question in The Myth of Sisyphus.