請觀音經疏 1.21

1.21

Question: For what reason does one invite that Buddha? Answer: Invoking Śākyamuni in this land serves as the internal cause for dispelling and subduing; that Buddha and the two bodhisattvas serve as the external conditions. Since the stimulus and response of cause and conditions reside in the two Buddhas, he therefore exhorts them to make the invocation. Furthermore, that Buddha represents the objective realm of the Tathāgata's dharmakāya and true mark; Guanyin represents the wisdom of the correct contemplation of the Middle Way; Mahāsthāmaprāpta represents the pervasive cultivation through meritorious virtue and spiritual power. However, the sages are each fully endowed with the three virtues, lacking none; now each takes one approach as a direct expression, and the three persons are each designated by one dharma. Now, wishing to dispel and subdue poisonous harms, one must rely on the superior realm to reveal the dharmakāya, must also rely on wisdom to illuminate and eliminate delusions, and must also rely on meritorious virtue to support and accomplish wisdom; therefore, all three sages are invited together.