楞伽阿跋多羅寶經註解 2.18

2.18

釋分別自心現中，言觀三界唯心分齊者，三界由妄想而起，妄想不出自心。分齊者，界限也。了知心外無法，則人法二執俱離。復何動作去來之相？但由無始妄想熏故，有三界種種五陰繫縛。言色行者，略舉五陰之二耳。由有五陰之身，故有資身財物建立，如是諸法皆因自心妄想顯現。若知本來空寂，安有生滅？是為善分別也。

In explaining the discernment of what appears from one's own mind, the phrase 'contemplates the scope of the three realms as mind-only' means that the three realms arise from vikalpa, and vikalpa does not go beyond one's own mind. 'Scope' (limit/boundary) means realm. Understanding that outside the mind there is no dharma, both the grasping at person and grasping at dharmas are abandoned. What marks of movement, coming, or going could there still be? Merely due to the perfuming of beginningless false vikalpa, there is the bondage of the various five skandhas of the three realms. Mentioning 'forms and formations' (rūpa and saṃskāra) is merely a brief citation of two of the five skandhas. Because there is the body of the five skandhas, there is the establishment of wealth and goods that support the body; all such dharmas appear due to the vikalpa of one's own mind. If one knows that they are fundamentally empty and tranquil, how could there be arising and ceasing? This is skillful discernment.