妙法蓮華經文句 2.15

2.15

約教者，滅喧入真，三藏寂靜。即喧而真，通寂靜。離二邊入中，別寂靜。即邊而中，圓寂靜。

In terms of the teachings: extinguishing noise and entering truth is the stillness of the Tripiṭaka [teaching]. Noise itself being truth is the stillness of the shared [teaching]. Departing from the two extremes and entering the middle is the stillness of the distinctive [teaching]. The extremes themselves being the middle is the stillness of the perfect [teaching].