四明十義書 1.139

1.139

然內外二觀皆為破內心分別。若內心觀成，分別已亡，則歷外境時任運入不二法門也。

Now, both inner and outer contemplations are for breaking the discrimination of the inner mind. If the inner mind's contemplation is completed and discrimination has already perished, then when traversing external objects, one enters the non-dual Dharma gate naturally.