四明十義書 1.176

1.176

若如一家教文所談修觀，成與未成皆須遍歷諸法也。若修內觀，先用妙解攝外法入心，但觀內心具諸法性。攝法之義既成，專內之義又成。若修外觀，亦先用妙解攝諸法及內心入外色等一法，修唯色等觀。攝法之義既成，唯專一境之義又成。豈非二觀俱有所以也。

If it is as taught in the textual teachings of our tradition regarding the cultivation of contemplation, then both when it is accomplished and when it is not yet accomplished, one must pervasively pass through all dharmas. If cultivating internal contemplation, one first uses subtle understanding to gather external dharmas into the mind, only contemplating the internal mind as possessing the nature of all dharmas. Once the meaning of gathering dharmas is established, the meaning of being focused solely on the internal is also established. If cultivating external contemplation, one also first uses subtle understanding to gather all dharmas and the internal mind into a single dharma such as external form, cultivating the contemplation of form-only and the like. Once the meaning of gathering dharmas is established, the meaning of focusing solely on a single object is also established. How could both contemplations not have their valid grounds?