大毘盧遮那成佛經疏 10.11

10.11

爾時虛空藏菩薩入清淨境界三昧自心說者，所謂住此三昧，能知自心本性清淨，了達如是清淨法界之境，即是大空之祕藏也。又此虛空藏即是大悲胎藏，能長養成就菩提之心也。

At that time Bodhisattva Ākāśagarbha entered the samādhi of the pure realm and spoke from his own mind: that is to say, abiding in this samādhi, he is able to know that the original nature of his own mind is pure, and comprehend that such a realm of the pure dharmadhātu is the secret treasury of great emptiness. Furthermore, this Ākāśagarbha is itself the great compassion womb, able to nurture and accomplish the bodhicitta.