The oracle bone character, Zhi, is a superposition of a figurative arrow and an opening, like an arrow piercing through the heart, hitting the vitals, hitting the target, and accomplishing the goal. Zhi, polyphonic and polysemantic, gets its meaning from a single arrow, like a key in a lock, which opens the door, Yin Zhi, implies: enlightenment, penetration, open-mindedness. Metaphor: to know, to understand. E.g.: to know. Derived from: to fertilize. See I Ching: 归妹, 君子以, 永终知敝. Knowing, echoing 'returning to the sister', refers to insemination in the round room. Getting the meaning of having something to target, embodying insight, yinzhi (音智), ancient same as zhi (智), allegory: insight, insightfulness. Metaphor: wisdom, insight. Derived from: wise. See also: knower of water. Zhizu. Meaning, Confucius, is the pier of wisdom, where the ferry of the ocean of knowledge is located. Knowing itself, there must be action, there must be action in the first, there will be results in the latter, that is, the so-called 'knowledge and action', knowledge but not, only ideas, no action, or action, but not as good as not up to it, can not be said to know, just like Lin Daiyu said Jia Baoyu, is a silver wax gun head, can only be when the pose, not enough to hard, can not be line, only in the look, not in the use. The