Sir Aurel Stein,
The Thousand Buddhas
(1921)
“ They are either men who, having won the right to enter Buddhahood, refuse that peace for the sake of suffering mankind, or else celestial beings who assume a human form. Of this last order of beings is Avalokiteśvara, whom the Chinese know as Kuan-yin, and the Japanese as Kwannon; the favourite object of adoration in Mahāyāna Buddhism. He appears in art both in male and female form. In later art the female form is almost universal, but in the Tun-huang paintings the male form is predominant. Avalokiteśvara is the spiritual son of Amitābha, the impersonal Buddha, the Light of the Enlightened ”
