nine gradual vehicles. Shravaka, Pratyekabuddha, Bodhisattva, Kriya, Upa, Yoga, Maha Yoga, Anu Yoga, and Ati Yoga. The first two are Hinayana; the third is Mahayana; the next three are the Three Outer Tantras; and the last three are called the Three Inner Tantras
the nine gradual vehicles; Pious attendants, self-centered buddhas, bodhisattvas, Kriya tantra, Ubhaya tantra, Yoga tantra, Mahayoga, Anu Yoga, and Atiyoga. nine stages of spiritual approaches