Suicide may also be regarded as an experiment — a question which man puts to Nature, trying to force her to answer. The question is this: What change will death produce in a man's existence and in his insight into the nature of things? It is a clumsy experiment to make; for it involves the destruction of the very consciousness which puts the question and awaits the answer.

Vol. 2, Ch. 13, § 160 - Parerga and Paralipomena (1851) - Counsels and Maxims