"community of monks and nuns" (Pāli: bhikkhu-sangha; bhikkhuni-sangha) refers to a community of four or more monks or nuns who are living in a permanent or semi-permanent single-sex community (in the contemporary West monks and nuns may live within the same monastery but in separate living quarters). Within this community of monks and nuns there is a further sub-division containing practitioners (who are nonetheless still living among their fellow renunciates) possessed of some substantive level of realization (namely, those who have at least gained stream-entry). This core group is called the "noble sangha" (ariya-sangha). The "community of disciples" (Pāli: sāvaka-sangha) refers to the broad community of monks, nuns, and male and female layfollowers. For an example of a traditional stock reference to the sāvaka-sangha in the Pali canon, in "The Crest of the Standard" discourse (SN 11.3), the Buddha advises his monks that, if they experience fear, they can recollect the Buddha or the Dhamma or the Sangha; and, in recollecting the Sangha they should recall: "The Sangha of the Blessed One's disciples [sāvaka-sangha] is practising the good way, practising the straight way, practising the true way, practising the proper way; that is, the four pairs of persons, the eight types of individuals...." A similar phrase can also be found in the lay disciple's daily chant, "Sangha Vandanā" ("Salutation to the Sangha"). Mahāyāna view In Mahayana Buddhism, śrāvakas or arhats are sometimes contrasted negatively with bodhisattvas. In the 4th century abhidharma work Abhidharmasamuccaya, Asaṅga describes those who follow the Śrāvakayāna. These people are described as having weak faculties, following the Śrāvaka Dharma, utilizing the Śrāvaka Piṭaka, being set on their own liberation, and cultivating detachment in order to attain liberation. Those in the Pratyekabuddhayāna are portrayed as also utilizing the Śrāvaka Piṭaka, are said to have medium faculties, to follow the Pratyekabuddha Dharma, and to be set on their own personal enlightenment. Finally, those in the Mahāyāna "Great Vehicle" are portrayed as utilizing the Bodhisattva Piṭaka, as having sharp faculties, following the Bodhisattva Dharma, and set on the perfection and liberation of all beings, and the attainment of complete enlightenment. According to Vasubandhu's Yogacara teachings, there are four types of śrāvakas: The fixed The arrogant The transformed The converted (to "Bodhi" or Buddhism) The transformed and the converted (Buddhist) are assured of eventual Nirvana in the Lotus Sutra. According to Je Tsongkhapa, founder of the Gelug school of Tibetan Buddhism: