大毘盧遮那經供養次第法疏 2.63

2.63

第五段中，「次復起增上心」以下，於出道場以後，外讀經處事業也。觀世者，菩薩名也。蓮華者，蓮華部主也。眼者，諸佛眼門也。本性加持者，本尊種子印等也。觀自在種子心真言門。娑是諸漏，傍有二點即是阿，除遣諸漏。無漏觀，故自在也。觀音菩薩真言門。次觀音菩薩入于普觀（去聲）三昧，住是平等無所不遍，名為普入。以此普眼而觀眾生故名觀自在者，入此三昧已，從其心出種種光，光中現是諸法門真言也。

In the fifth section, from 'Next, again generating an elevated mind' onward, refers to the activities in the place of reciting sūtras outside, after leaving the bodhimaṇḍa. 'Guanshi' (Observing the World) is the name of the bodhisattva. 'Lotus' refers to the lord of the Padma family. 'Eye' is the gateway of the eyes of all Buddhas. 'Empowerment of intrinsic nature' refers to the deity's seed syllable, mudrā, and so on. This is the seed hṛdaya-mantra gateway of Avalokiteśvara: SA represents all outflows; with two visarga dots at the side it becomes AḤ, dispelling all outflows. Observing without outflows, one is therefore sovereign (īśvara). This is the mantra gateway of Bodhisattva Avalokiteśvara. Next, Bodhisattva Avalokiteśvara enters the Samādhi of Universal Observation; abiding in this equality, there is nowhere it does not pervade, which is called 'universal entry'. Because he observes sentient beings with this universal eye, he is called Avalokiteśvara. Having entered this samādhi, various lights emanate from his heart, and in the lights these Dharma-gate mantras appear.