四明十義書 1.132

1.132

自有內外兼修，則如方等懺儀正修內觀。若對外境，乃用內心正觀之法，旁歷尊容道具皆成三昧也。

Second, there is cultivating both inner and outer simultaneously, which is like the Vaipulya Repentance ritual where one directly cultivates inner contemplation; when facing external objects, one employs the method of the direct contemplation of the inner mind, and secondarily traversing the venerable images and ritual implements, they all become samādhi.