Toegye(退溪) classified the body of things and its practical operations
into the first meaning for the domain of law and the second meaning for
the domain of substance, and then he considered the first meaning for the
domain of law as a implication between the state of all-complete
provision and the state of function. From the point of view that the
movement and quiescence of reason equal to the body of things and its
practical operations, besides, he considered the movement and quiescence
of reason as the logical basis of the body of things and its practical
operations for the domain of law.
By the way, while Toegye had to contend that the reason has
movement and quiescence, his opinion of this consideration incurred a
misunderstanding as if he had contended that the reason has autonomic
activeness. However, in Toegye's opinion, the movement and quiescence
of reason as good as the reference from Huiam(晦庵) has entirely
declared for the domain of law. Consequently, We can not regard the
movement of reason declared by Toegye as an autonomic activeness of
reason.
In Toegye's opinion, the practical operations of reason is nothing but a
reason that causes natural passion to move. Formerly, Riemgye(濂溪)
described this conception as a being mysterious activity by the names of
passableness and marvelous response in reason. The conception of the
reaching of reason declared by Toegye was based on this description. The
reaching of reason is the result of passableness. Passableness is a state of
unification of immobility and activeness. The critical censure of the latest
theory of the reaching of things presented by Toegye was derived from a
point of view that was not far-sighted enough to think of this conception
closely.