He discusses the materialist foundation of Vedic rituals, which he finds similar to the magical belief of controlling the natural forces through yajnas, etc.
Yogic moksha replaced Vedic rituals with personal development and meditation, with hierarchical creation of the ultimate knowledge in self as the path to moksha.
Such knowledge, whether it be Vedic, agamic, architectural, musical or spiritual, is imparted through the developing relationship between the guru and the disciple.