Boundless compassion for all living beings is the surest and most certain guarantee of pure moral conduct, and needs no casuistry. Whoever is filled … - Arthur Schopenhauer

Boundless compassion for all living beings is the surest and most certain guarantee of pure moral conduct, and needs no casuistry. Whoever is filled with it will assuredly injure no one, do harm to no one, encroach on no man's rights; he will rather have regard for every one, forgive every one, help every one as far as he can, and all his actions will bear the stamp of justice and loving-kindness.

man is the only animal which causes pain to others with no other object than causing pain…No animal ever torments another for the sake of tormenting: but man does so, and it is this which constitutes the diabolical nature which is far worse than the merely bestial

حياة الوحدة مصير كل الأرواح العظيمة.

Epicurus, the great teacher of happiness, has correctly and finely divided human needs into three classes. First there are the natural and necessary needs which, if they are not satisfied, cause pain. Consequently, they are only victus et amictus [food and clothing] and are easy to satisfy. Then we have those that are natural yet not necessary, that is, the needs for sexual satisfaction. … These needs are more difficult to satisfy. Finally, there are those that are neither natural nor necessary, the needs for luxury, extravagance, pomp, and splendour, which are without end and very difficult to satisfy.