farewell, knack

訣 is composed of the radical 言 (speech) and 夬 (decisive). 夬 depicts a hand holding a notched ring-shaped jade artifact, implying decision or separation. Words spoken from the mouth do not return, resembling a parting, as represented by 訣. The notched jade ring symbolizes an opening or exit, extending to mean resolving a difficult problem. Thus, 訣 also refers to a method.