At this point, I can no longer avoid setting out, in an initial, provisional statement, my own hypothesis about the origin of “bad conscience.” It is not easy to get people to attend to it, and it requires them to consider it at length, to guard it, and to sleep on it. I consider bad conscience the profound illness which human beings had to come down with, under the pressure of the most fundamental of all the changes which they experienced—that change when they finally found themselves locked within the confines of society and peace. Just like the things water animals must have gone though when they were forced either to become land animals or to die off, so events must have played themselves out with this half-beast so happily adapted to the wilderness, war, wandering around, adventure—suddenly all its instincts were devalued and “disengaged.”From this point on, these animals were to go on foot and “carry themselves”; whereas previously they had been supported by the water. A terrible heaviness weighed them down. In performing the simplest things they felt ungainly. In dealing with this new unknown world, they no longer had their old leader, the ruling unconscious drives which guided them safely. These unfortunate creatures were reduced to thinking, inferring, calculating, bringing together cause and effect, reduced to their “consciousness,” their most impoverished and error-prone organ! I believe that on earth there has never been such a feeling of misery, such a leaden discomfort—while at the same time those old instincts had not all at once stopped imposing their demands! Only it was difficult and seldom possible to do their bidding. For the most part, they had to find new and, as it were, underground satisfactions for them.

~ Friedrich Nietzsche

My thoughts on the descent of our moral prejudices – for that is what this polemic is about – were first set out in a sketchy and provisional way in the collection of aphorisms entitled Human, All Too Human. A Book for Free Spirits, which I began to write in Sorrento during a winter that enabled me to pause, like a wanderer pauses, to take in the vast and dangerous land through which my mind had hitherto travelled. This was in the winter of 1876–7; the thoughts themselves go back further. They were mainly the same thoughts which I shall be taking up again in the present essays – let us hope that the long interval has done them good, that they have become riper, brighter, stronger and more perfect! The fact that I still stick to them today, and that they themselves in the meantime have stuck together increasingly firmly, even growing into one another and growing into one, makes me all the more blithely confident that from the first, they did not arise in me individually, randomly or sporadically but as stemming from a single root, from a fundamental will to knowledge deep inside me which took control, speaking more and more clearly and making ever clearer demands. And this is the only thing proper for a philosopher. We have no right to stand out individually: we must not either make mistakes or hit on the truth individually. Instead, our thoughts, values, every ‘yes’, ‘no’, ‘if ’ and ‘but’ grow from us with the same inevitability as fruits borne on the tree – all related and referring to one another and a testimonial to one will, one health, one earth, one sun. – Do you like the taste of our fruit? – But of what concern is that to the trees? And of what concern is it to us philosophers? . . .

~ Friedrich Nietzsche