path (ekayana), which is the bodhisattva path to full Buddhahood. Thus, these three separate goals are not really different at all, the 'lesser' paths are actually just clever teaching devices used by Buddhas to get people to practice, eventually though, they will be led to the one and only path of Mahāyāna and full Buddhahood. The Mahāyāna commentary the Abhisamayalamkara presents the path of the bodhisattva as a progressive formula of Five Paths (pañcamārga). A practitioner on the Five Paths advances through a progression of ten stages, referred to as the bodhisattva bhūmis (grounds or levels). Omniscience The end stage practice of the Mahāyāna removes the imprints of delusions, the obstructions to omniscience (sarvākārajñatā), which prevent simultaneous and direct knowledge of all phenomena. Only Buddhas have overcome these obstructions and, therefore, only Buddhas have omniscience knowledge, which refers to the power of a being in some way to have "simultaneous knowledge of all things whatsoever". From the Mahāyāna point of view, an arhat who has achieved the nirvana of the Lesser Vehicle will still have certain subtle obscurations that prevent the arhat from realizing complete omniscience. When these final obscurations are removed, the practitioner will attain apratiṣṭhita-nirvana and achieve full omniscience. Buddhahood's bodies Some Mahāyāna traditions see the Buddha in docetic terms, viewing his visible manifestations as projections from its nirvanic state. According to Etienne Lamotte, Buddhas are always and at all times in nirvana, and their corporeal displays of themselves and their Buddhic careers are ultimately illusory. Lamotte writes of the Buddhas: This doctrine, developed among the Mahāsaṃghikas, where the historical person, Gautama Buddha, was one of these transformation bodies (Skt. nirmāṇakāya), while the essential Buddha is equated with the transcendental Buddha called dharmakāya. In Mahāyāna, this eventually developed into the doctrine of the "Three Bodies" of the Buddha (Trikaya). This doctrine is interpreted in different ways by the different Mahāyāna traditions. According to Reginald Ray, it is "the body of reality itself, without specific, delimited form, wherein the Buddha is identified with the spiritually charged nature of everything that is." Buddha-nature An alternative idea of Mahāyāna nirvana is found in the Tathāgatagarbha sūtras. The title itself means a garbha (womb, matrix, seed) containing Tathagata (Buddha). These Sutras suggest, states Paul Williams, that 'all sentient beings contain a Tathagata' as their 'essence, core or essential inner nature'. The tathāgatagarbha doctrine (also called buddhadhatu, buddha-nature), at its earliest probably appeared