"All under heaven know beauty and thus know ugliness; all recognize good and thus not good."
Good and evil, beauty and ugliness, right and wrong.
These are humanity's subjective judgments, not objective existences; beneficial birds and harmful insects, fierce beasts and auspicious beasts, these too are judgments of humankind.
Only since the reign of the goddess Nüwa have these concepts emerged, with the creation of "the way of humanity."
All creatures struggle and kill, the weak are prey to the strong; these are the natural state within an even greater framework than "the way of humanity."
Outside of "the way of humanity," there is no good or evil, no right or wrong; the food chain, from top to bottom, is without distinction of virtue or fault.