四明十義書 2.134

2.134

故一家之教，依此意故，乃立陰心為所觀境。所以《止觀》及以諸文皆令觀心，以取近要之心為觀所託。若無所託陰界入境，觀依何修？理依何顯？故離三障四魔則無所觀境界也。

Therefore, the teachings of our school, relying on this intent, establish the mind of the aggregates as the object of contemplation. This is why the *Zhiguan* and various texts all enjoin contemplating the mind, taking the proximate and essential mind as that upon which contemplation relies. If there is no object of the aggregates, realms, and sense-fields to rely upon, upon what would contemplation be cultivated? Upon what would principle be revealed? Therefore, apart from the three obstacles and four māras, there is no realm of objects to be contemplated.