佛頂尊勝陀羅尼經教跡義記 2.101

2.101

唐云一切如來安慰令得加持也。解曰：持誦稱名意願極廣，非但要身清淨，亦願六趣悉皆清淨，若無外護而相攝授，云何自身能得成就？是以，諸佛一切如來同共加持，方有覆護，如人怖畏假勢乃安。亦如善住空中聞聲驚怖當來，具申帝釋，帝釋速往轉問世尊，佛以慈悲冥加法力，真言持誦諸苦悉除也。

In Chinese, it means "all Tathāgatas console and bring about empowerment." The explanation states: The aspiration in upholding and reciting the mantra while uttering the name is extremely vast: not only does one desire the body to be pure, but one also aspires that the six destinies be completely pure. If there were no external protection to gather and embrace them, how could one's own body achieve accomplishment? Therefore, all Buddhas and Tathāgatas jointly empower them, only then providing sheltering protection, just as a person who is terrified becomes secure only by relying on authority. It is also like Susthita who, hearing the voice in the air, was terrified of what was to come and reported it fully to Śakra; Śakra went swiftly to ask the World-Honoured One in turn, and the Buddha, out of compassion, invisibly bestowed the Dharma power, so that by upholding and reciting the mantra all sufferings were entirely eliminated.