To understand is to perceive patterns.

凡事天下要考察有无的原则,必定是以众人的耳目所见所闻的实情以知有与无来作为标准的。

If oxen and horses and lions had hands and could paint with their hands and produce works of art as men do, horses would paint the forms of the gods like horses, and oxen like oxen, and they would make their bodies in accordance with the form that each species itself possesses.