首楞嚴義疏注經 5.290

5.290

行彌法界曰普，位隣極聖曰賢。河沙佛所為法王子，諸佛弟子發我行者皆名普賢。

When practice pervades the dharmadhātu, it is called 'Universal' (samanta); when one's stage is close to the ultimate sage, it is called 'Good' (bhadra). At the dwellings of Buddhas as numerous as sands of the Ganges he became a Dharma prince; disciples of all Buddhas who give rise to my practice are all named Samantabhadra.