What is the origin of the idiom "context"?

The origin of the idiom "context" is: Wu Ming Rachel's "Yun Fu Ji Niu Mian Xue": "There are fertile fields in a thousand hills here, and the context is close to the mountains, and it is qualified everywhere."

Background: Lelong Kumai

Interpretation: This refers to the trend and direction of mountains. Now compare the cause and effect of one thing.

Example: You must find out the ins and outs of this matter as soon as possible, and then tell me.

I finally figured out the ins and outs of this matter.

The actual "context" was first related to ancient geomantic omen. Ancient feng shui experts paid attention to the trend of mountains and rivers. They call the mountain "dragon", observe the trend and ups and downs of the mountain, and look for the trend of gas accumulation. They also called rivers "dragons", and pursued the source and flow direction of water, which resulted in the "context" theory. Later, this idiom was gradually quoted to other aspects.