首楞嚴義疏注經 8.287

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四也。曠兼無際故大，正法自持故方，稱體而周故廣，即三大義也。妙名不可思議，蓮華喻開佛知見，出煩惱礙智礙，見佛性故，如出水開敷也。又能於法自在，諸三昧首，故名為王。生諸佛，故名母。持善遮惡總攝功德，名陀羅尼。呪即詛也。此約顯益以立名也。

Fourth. Boundlessly extensive, so it is 'great'; upholding the true Dharma in itself, so it is 'correct'; conforming to the essence and pervasive, so it is 'vast'—namely, the meaning of the three greats. 'Wondrous' means inconceivable. 'Lotus flower' is an analogy for disclosing the Buddha's knowledge and vision, emerging from the affliction hindrance and the knowledge hindrance to see the Buddha-nature, like [a lotus] emerging from the water and blossoming. Furthermore, able to be sovereign in phenomena and the chief of all samādhis, it is thus called 'king.' Generating all Buddhas, it is thus called 'mother.' Upholding the good, preventing evil, and gathering all merits, it is called 'dhāraṇī.' 'Mantra' (zhou) means incantation. This establishes the name in terms of manifest benefits.