Analysis of information sources in references of the Wikipedia article "마음작용 (현양성교론)" in Korean language version.
[It is] sufficiently obvious that Asaṅga had been a Mahīśāsaka when he was a young monk, and that he incorporated a large part of the doctrinal opinions proper to this school within his own work after he became a great master of the Mahāyāna, when he made up what can be considered as a new and Mahāyānist 《Abhidharma-piṭaka》.
In the record of his journeys through the kingdoms of India, Xuanzang wrote that Asaṅga was initially a Mahīśāsaka monk, but soon turned toward the Mahāyāna teachings.[6] Asaṅga had a half-brother, Vasubandhu, who was a monk from the Sarvāstivāda school. Vasubandhu is said to have taken up Mahāyāna Buddhism after meeting with Asaṅga and one of Asaṅga's disciples.[7]
