"In short, attaining and bringing to completion all the bodhisattva deeds, and, likewise, attaining and bringing to completion the perfections, levels, forbearances, concentrations, superknowledges, retentions of teachings heard, dedications, aspirational prayers, confidence to speak, and all the qualities of a buddha are contingent upon the guru. The guru is the root from which they arise. The guru is the source and creator from which they are produced. The guru increases them. They depend upon the guru. The guru is their cause."

Bodhisattvapiṭaka