This is a consequence which the Theist rejects." Vasubandhu finishes this section of his commentary by stating that sentient beings wander from birth to birth doing various actions, experiencing the effects of their karma and "falsely thinking that God is the cause of this effect. We must explain the truth in order to put an end to this false conception." Other Yogacara philosophers The Chinese monk Xuanzang (fl. c. 602–664) studied Buddhism in India during the seventh century, staying at Nalanda. There, he studied the Yogacara teachings passed down from Asanga and Vasubandhu and taught to him by the abbot Śīlabhadra. In his work Cheng Weishi Lun (Skt. Vijñāptimātratāsiddhi śāstra), Xuanzang refutes a "Great Lord" or Great Brahmā doctrine: The 7th-century Buddhist scholar Dharmakīrti advances a number of arguments against the existence of a creator god in his Pramāṇavārtika, following in the footsteps of Vasubandhu. Later Mahayana scholars, such as Śāntarakṣita, Kamalaśīla, Śaṅkaranandana (fl. c. 9th or 10th century), and Jñānaśrīmitra (fl. 975-1025), also continued to write and develop the Buddhist anti-theistic arguments. The 11th-century Buddhist philosopher Ratnakīrti, at the former university at Vikramashila (now Bhagalpur, Bihar), criticized the arguments for the existence of a God-like being called Isvara that emerged in the Navya-Nyaya sub-school of Hinduism, in his "Refutation of Arguments Establishing Īśvara" (Īśvara-sādhana-dūṣaṇa). These arguments are similar to those used by other sub-schools of Hinduism and Jainism that questioned the Navya-Nyaya theory of a dualistic creator. Theravada Buddhists The influential Theravada commentator Buddhaghosa also specifically denied the concept of a Creator. He wrote: "For there is no god Brahma. The maker of the conditioned world of rebirths. Phenomena alone flow on. Conditioned by the coming together of causes." (Visuddhimagga 603). Adi-Buddha doctrine The Buddhist idea of the "Adi-Buddha" (Primordial Buddha or First Buddha) has been seen by some writers as resembling theism in some ways, though other Buddhist writers disagree. The similarity of the Adi-Buddha theory to theism B. Alan Wallace writes on how the Vajrayana concept of the primordial Buddha (Adi-Buddha), who in some scriptures is viewed as one with the tathāgatagarbha, is sometimes seen as forming the foundation of both samsara and nirvana. This view, according to Wallace, holds that "the entire universe consists of nothing other than displays of this infinite, radiant, empty awareness." Furthermore, Wallace notes similarities between these Vajrayana doctrines and notions of a divine creative "ground of being". He writes: "a careful