The brain may be regarded as a kind of parasite of the organism, a pensioner, as it were, who dwells with the body.
Arthur SchopenhauerSuicide 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.
Arthur SchopenhauerThere is only one inborn erroneous notion ... that we exist in order to be happy ... So long as we persist in this inborn error ... the world seems to us full of contradictions. For at every step, in great things and small, we are bound to experience that the world and life are certainly not arranged for the purpose of maintaining a happy existence ... hence the countenances of almost all elderly persons wear the expression of ... disappointment.
Arthur Schopenhauer