On Yuan Chwang's Travels in India, 629–645 A.D. v2.c19.91

v2.c19.91

According to the Life the Chin-kang-tso or Vajrāsana was so called because it was made of adamant (vajra), an indestructible substance which could destroy everything. The two images of Kuan-tzŭ-tsai P'usa here mentioned apparently did not exist at the time of Fa-hsien's visit, and they are not in other treatises. Asoka's stone wall round the Bodhi Tree is apparently the wall which Fa-hsien says was made of brick. Then Fa-hsien tells of a tope here, and the Asokāvadāna mentions the building of one at the spot by Asoka: the tope at the Bodhi Tree, moreover, was one of the Eight Great Topes, and was visited by pilgrims. So it is strange that Yuan-chuang does not make any reference to a tope at the place where the P'usa attained Buddhahood.