Full Idea
Rituals and standards of righteousness and proper models and measures are produced from the deliberate efforts of the sage; they are not produced from people's nature.
Gist of Idea
Rituals don't arise from human nature; they are the deliberate creations of a sage
Source
Xunzi (Xun Kuang) (The Xunzi [c.250 BCE], 23), quoted by Bryan van Norden - Intro to Classical Chinese Philosophy 10.III
Book Reference
Norden,Bryan van: 'Intro to Classical Chinese Philosophy' [Hackett 2011], p.169
A Reaction
This is not to say that the sage is not in tune with nature. Human nature is often seen as a sprouting seed, which needs careful husbandry to bring out its best.