Better Never to Have Been: The Harm Of Coming Into Existence by David Benatar . The best argument I've read as to what it means for a human being to be brought into existence, why it does that person more harm than good, and why we should consider the question. While people generally find the idea distasteful, especially if being or becoming a parent is a primary focus of their life, I have yet to see any well-reasoned refutation to his argument that isn't addressed in the book. The only problem is it can leave you with a somewhat constant feeling of "well, what now?".