Qian and Kun, do they not constitute the arcane source for change! When Qian and Kun form ranks, change stands in their midst, but if Qian and Kun were to disintegrate, there would be no way that change could manifest itself.
This passage establishes Qian and Kun as the paired ontological ground of all change and transformation in the I Ching system, making Qian's creative polarity with Kun indispensable to the very possibility of divination and cosmological process.
, The Classic of Changes: A New Translation of the I Ching as Interpreted by Wang Bi, 1994thesis