Full Idea
If suicide is allowed, then everything is allowed. If anything is not allowed, then suicide is not allowed. This throws a light on the nature of ethics, for suicide is, so to speak, the elementary sin.
Gist of Idea
Absolute prohibitions are the essence of ethics, and suicide is the most obvious example
Source
Ludwig Wittgenstein (Notebooks 1914-1916 [1915], end), quoted by Jonathan Glover - Causing Death and Saving Lives §13
Book Reference
Glover,Jonathan: 'Causing Death and Saving Lives' [Penguin 1982], p.171
A Reaction
This reveals the religious streak in Wittgenstein. I am reluctant to judge suicide, but this seems wrong. Should a 'jumper' worry if they land on someone else and kill them? Of course they should.