The question of why Leibniz in his last letter to Nicolas Remond interrupted the explanation of his binary system is reducible to the question of which role it actually plays in this letter. This can be answered, when the mathematical meaning of the Dyadic as well as its analogical function (as symbol of the creation) are seen in the context of the so called Chinese Rites Controversy. In this context the role of the binary system changed in Leibniz`s thought. As (...) a mathematical decoding system of the mysterious characters of the oldest Chinese Philosopher Fuxi, it got a high status in epistemological as well as historical sciences. But as a pretended deeper knowledge of a creatio ex nihilo the dyadic attained immediately an enormous missiological meaning: It witnessed no more than the existence of an original monotheism and its theology of creation in China. However, when it became evident that the decisions in Rome would cause the end of the old Jesuit-mission in China, Leibniz within the frame of the natural theology (expected in pagan and old Chinese thinking) restricted the missiological meaning to its role as natural mathematical knowledge of China in primeval times. (shrink)