注大乘入楞伽經 8.233

8.233

九觀心者，可以意得，若不觀心，非己智分，不能開發自家寶藏；縱福智齊修，盡隨物轉，功歸生滅，無漏勝因皆不成就。故《淨名》云「諸佛解脫，當於眾生心行中求」也。

Ninth, contemplating the mind: It can be grasped through the mind. If one does not contemplate the mind, it does not belong to one's own share of wisdom, and one cannot open up one's own treasure-house. Even if one cultivates merit and wisdom equally, they will entirely turn along with external things, their efficacy will revert to arising and ceasing, and the superior undefiled causes will not be accomplished at all. Hence the Vimalakīrti-nirdeśa states, 'The liberation of all Buddhas should be sought in the mental conduct of sentient beings.'