Nietzsche says that, “for the sake of clarity, it was necessary artificially to isolate the different roots of that complex structure that is called morality. Each of these three treatises expresses a single primum mobile; a fourth and fifth are missing, as is even the most essential (‘the herd instinct’) – for the time being, the latter had to be ignored, as too comprehensive, and the same holds for the ultimate summation of all those different elements and thus a final account of morality.” Nietzsche also points out that each treatise makes a contribution to the genesis of Christianity and rejects an explanation of Christianity in terms of only one psychological category. The topics of the treatises are “good” and “evil” (first treatise), the “bad conscience” (second), and the “ascetic ideal” (third). The postcard suggests that Nietzsche discusses these topics separately because a joint treatment is too complicated, but that in reality, these ideas are inextricably intertwined, both with each other and with others that Nietzsche omits. Therefore, the three treatises should be regarded as parts of a unified theory and critique of morality.