大乘入道次第開決 1.61

1.61

As for "superior knowledge capable of containing, etc.": the Mahāyānasaṃgraha says that by obtaining the knowledge that universally takes all phenomena as object, one universally takes all phenomena such as the sūtras as object without departing from tathatā. This is the knowledge whose object is the common mark of all phenomena. It is like a great cloud: the doors of dhāraṇī and samādhi are like pure water; knowledge can store them just as a cloud holds water. Because it has the superior capacity to generate them, it is called the Dharma Cloud.