Manjushri, that comment caused the Elder’s son to make a vow: “From now until the ends of future time throughout uncountable eons I¹⁶ will use expansive expedient means to help beings in the Six Paths who are suffering for their offenses. Only when they have all been liberated, will I myself become a Buddha.” From the time he made that great vow in the presence of that Buddha until now, hundreds of thousands of nayutas of inexpressibly many eons have passed and still he is a Bodhisattva.

(The Sutra of the Past Vows of Earth Store Bodhisattva)