Zhuangzi on the inevitability of good and bad

Those who say they would have right without its correlate, wrong, or good government without its correlate, misrule, do not apprehend the great principles of the universe. One might as well talk of the existence of Heaven without that of Earth, or of the negative principle without the positive, which is clearly impossible. Yet people keep on discussing it without stop; such people are either fools or knaves.

  --Zhuangzi (莊子) (ca 369-298 B.C.) translated by Lin Yutang ( 林語堂) (1895-1976) [ch. Autumn Floods]

故曰：蓋師是而無非，師治而無亂乎？是未明天地之理，萬物之情者也。是猶師天而無地，師陰而無陽，其不可行明矣。然且語而不舍，非愚則誣也。