大毘盧遮那成佛經疏 10.29

10.29

然此真言以初怛字為體，即是如如也。如如即是諸佛境界，我今從彼而生也。白者即是菩提之心，住此菩提之心，即是自住處也。此菩提心從佛境界生也，常住於此，能生諸佛也。此是觀音母，即蓮花部主也。

Now this mantra takes the initial syllable ta as its essence, which is suchness. Suchness is the realm of the Buddhas, from which I am now born. White (pāṇḍara) is the bodhicitta; abiding in this bodhicitta is one's own dwelling place (vāsinī). This bodhicitta is born from the realm of the Buddhas; constantly abiding in this, it can give birth to the Buddhas. She is the mother of Avalokiteśvara, namely the lord of the Lotus Family.