Morality is neither rational nor absolute nor natural. World has known many moral systems, each of which advances claims universality; all moral systems are therefore particular, serving a specific purpose for their propagators or creators, and enforcing a certain regime that disciplines human beings for social life by narrowing our perspectives and limiting our horizons.
Friedrich NietzscheGo through the moral demands...one by one and you will find that man could not live up to them; the intention is not that he should become more moral, but that he should feel as sinful as possible. If man had failed to find this feeling pleasant - why should he have engendered such an idea and adhered to it for so long?... Man was by every means to be made sinful and thereby become excited, animated, enlivened in general. To excite, animate, enliven at any price.
Friedrich Nietzsche