註華嚴經題法界觀門頌 1.64

1.64

竿頭絲線從君弄，不犯清波意自殊。斯則無用之用，用不涉功。

Let you toy with the silk line at the end of the fishing pole; undisturbed by the clear waves, the meaning is distinct of itself. This is the function of non-function, a functioning not involved in deliberate effort.