摩訶止觀 3.44

3.44

三、息二邊分別止者，生死流動、涅槃保證，皆是偏行、偏用，不會中道。今知俗非俗，俗邊寂然；亦不得非俗，空邊寂然，名「息二邊止」。

Third, the calming of ceasing discrimination of the two extremes: the flux of birth and death and the clinging realization of nirvāṇa are both one-sided practices and one-sided applications, not according with the middle way. Now, knowing that the worldly is not worldly, the worldly extreme is quieted; also not attaining the non-worldly, the empty extreme is quieted; this is called 'calming of ceasing the two extremes'.