一切經音義 42.166

42.166

安怛袒那（祖音壇爛反梵語也唐言潛隱即是隱形良謂彼國邪正雜信異道間居更相是非顯已破彼佛以神力故說斯要欲令修瑜伽者隨意自在無礙速成若起垢心邪惡處無礙速成驗故釋此疑）。

安怛袒那 [Antardhāna] (The sound is zǔ plus tán and làn fanqie. A Sanskrit word; in the Tang language it means "concealment", which is invisibility. Because in that country [India] the orthodox and heterodox are mixed in their beliefs, and disparate paths dwell side by side, criticizing each other and asserting themselves while refuting others, the Buddha, by his supernatural power, expounded this essential method, wishing to cause Yoga practitioners to achieve free and unobstructed rapid success at will. If defiled thoughts arise in depraved or wicked places, unobstructed rapid success serves as verification; hence this doubt is resolved).