Man is the only animal who causes pain to others with no other object than wanting to do so.

The fundament upon which all our knowledge and learning rests is the inexplicable.

There 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.

Sexual passion is the cause of war and the end of peace, the basis of what is serious... and consequently the concentration of all desire

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.

Ist es an und fu? r sich absurd, das Nichtsein fu? r einUbel zu ? halten; da jedes Ubel wie jedes Gut das Dasein zur Voraussetzung hat, ja sogar das Bewusstsein. It is in and by itself absurd to regard non-existence as an evil; for every evil, like every good, presupposes existence, indeed even consciousness.

Religion is the masterpiece of the art of animal training, for it trains people as to how they shall think.