Chapter 1: Introduction: Bringing Kant, Schopenhauer, Nietzsche, and Wittgenstein TogetherChapter 2: Immanuel Kant. The Moral Duty of Self-PreservationChapter 3: Arthur Schopenhauer. The Metaphysical Futility of SuicideChapter 4: Friedrich Nietzsche. A Free Death at the Right TimeChapter 5: Ludwig Wittgenstein. Suicide as the Elementary SinChapter 6: Conclusion: What Kant, Schopenhauer, Nietzsche, and Wittgenstein Can Teach Us about Suicide