Nikāya or "Collection of the Long Discourses", a group of young Brahmins consulted Lord Buddha about the methods to seek fellowship/companionship/communion with Brahma. He replied that he personally knows the world of Brahma and the way to it, and explains the meditative method for reaching it by using an analogy of the resonance of the conch shell of the aṣṭamaṅgala: The Buddha then said that the monk must follow this up with an equal suffusion of the entire world with mental projections of compassion, sympathetic joy, and equanimity (regarding all beings with an eye of equality). In the two Metta Suttas of the Aṅguttara Nikāya, the Buddha states that those who practice radiating the four immeasurables in this life and die "without losing it" are destined for rebirth in a heavenly realm in their next life. In addition, if such a person is a Buddhist disciple (Pāli: sāvaka) and thus realizes the three characteristics of the five aggregates, then after his heavenly life, this disciple will reach nibbāna. Even if one is not a disciple, one will still attain the heavenly life, after which, however depending on what his past deeds may have been, one may be reborn in a hell realm, or as an animal or hungry ghost. In another sutta in the Aṅguttara Nikāya, the laywoman Sāmāvatī is mentioned as an example of someone who excels at loving-kindness. In the Buddhist tradition she is often referred to as such, often citing an account that an arrow shot at her was warded off through her spiritual power. Visuddhimagga The four immeasurables are explained in The Path of Purification (Visuddhimagga), written in the fifth century CE by the scholar and commentator Buddhaghoṣa. They are often practiced by taking each of the immeasurables in turn and applying it to oneself (a practice taught by many contemporary teachers and monastics that was established after the Pali Suttas were completed), and then to others nearby, and so on to everybody in the world, and to everybody in all universes. A Cavern of Treasures (mDzod-phug) A Cavern of Treasures () is a Bonpo terma uncovered by Shenchen Luga () in the early eleventh century. A segment of it enshrines a Bonpo evocation of the four immeasurables. Martin (n.d.: p. 21) identifies the importance of this scripture for studies of the Zhang-Zhung language. Origins Prior to the advent of the Buddha, according to Martin Wiltshire,