Listen to this articletǐyòng 体用
Ti and Yong
“体用”有三种不同含义：其一，形体、实体为“体”，形体、实体的功能、作用为“用”。其二，事物的本体为“体”，本体的显现、运用为“用”。其三，行事、行为的根本原则为“体”，根本原则的具体施用为“用”。在“体用”对待的关系中，“体”是基础，“用”是依赖于“体”的。
Ti (体) and yong (用) can be understood in three different ways: 1) a physical thing and its functions or roles; 2) the ontological existence of a thing and its expression and application; and 3) the fundamental code of conduct, and its observance. In any ti–yong relationship, ti provides the basis on which yong depends.
引例 Citations：
◎天者定体之名，乾者体用之称。（《周易·乾》孔颖达正义）
（“天”是确定实体的名称，“乾”是表现实体之功用的名称。）
Tian (天) means heaven in the physical sense, while qian (乾) means its functions and significance. (Kong Yingda: Correct Meaning of The Book of Changes)
◎至微者理也，至著者象也。体用一源，显微无间。（程颐《程氏易传》）
（最隐微的是理，最显著的是象。作为本体的理和作为现象的象出自同一来源，显著与隐微之间没有差别。）
What is most subtle is li (理), while what is most conspicuous is xiang (象). Li as the ontological existence and xiang as its manifestation are of the same origin; there is no difference between them. (Cheng Yi: Cheng Yi’s Commentary on The Book of Changes)
