According to Kūkai, esoteric Buddhism has the Dharmakaya (Jpn: "hosshin", embodiment of truth) as its source, which is associated with Vairocana Buddha (Dainichi). Hosshin is embodied absolute reality and truth. Hosshin is mostly ineffable but can be experienced through esoteric practices such as mudras and mantras. While Mahayana is taught by the historical Buddha (nirmankaya), it does not have ultimate reality as its source or the practices to experience the esoteric truth. For Shingon, from an enlightened perspective, the whole phenomenal world itself is also the teaching of Vairocana. The body of the world, its sounds and movements, is the body of truth (dharma) and furthermore it is also identical with the personal body of the cosmic Buddha. For Kūkai, world, actions, persons and Buddhas are all part of the cosmic monologue of Vairocana, they are the truth being preached, to its own self manifestations. This is "hosshin seppô" (literally: "the dharmakâya's expounding of the Dharma") which can be accessed through mantra which is the cosmic language of Vairocana emanating through cosmic vibration concentrated in sound. In a broad sense, the universe itself a huge text expressing ultimate truth (Dharma) which must be "read".