四明十義書 2.186

2.186

又且縱久修者既已於止觀境觀諳練，聞此事法之觀，即能用本習之心修之，不待玄文專示境觀也。

Furthermore, even granting that the long-practiced are already well-versed in the objects and contemplations of the Zhiguan, upon hearing this contemplation of phenomenal teachings they can immediately cultivate it using the mind they have originally practiced, without depending on the Xuanwen specifically to indicate the object and contemplation.