He who grasps the central pivot of Tao, is able to watch “Yes” and “No” pursue their alternating course around the circumference. He retains his perspective and clarity of judgment, so that he knows that “Yes” is “Yes” in the light of the “No” which stands over against it. He understands that happiness, when pushed to an extreme, becomes calamity. That beauty, when overdone, becomes ugliness. Clouds become rain and vapor ascends again to become clouds. To insist that the cloud should never turn to rain is to resist the dynamism of Tao.
