首楞嚴義疏注經 5.300

5.300

孫陀羅難陀即從座起，頂禮佛足而白佛言：「我初出家，從佛入道，雖具戒律，於三摩地心常散動，未獲無漏。世尊教我及俱絺羅觀鼻端白。」

Sundarananda then arose from his seat, bowed his head at the Buddha's feet, and said to the Buddha: "When I first went forth from home and followed the Buddha to enter the Way, although I maintained the precepts, in samādhi my mind was constantly scattered and agitated, and I had not yet attained the undefiled state. The World-Honoured One taught me and Kauṣṭhila to contemplate the whiteness at the tip of the nose."