Original text of the Śūraṅgama Sūtra: 孙陀罗难陀即从座起。顶礼佛足而白佛言。我初出家,从佛入道。虽具戒律。于三摩地。心常散动。未获无漏。世尊教我及拘絺罗。观鼻端白。我初谛观。经三七日。见鼻中气。出入如烟。身心内明。圆洞世界。遍成虚净。犹如琉璃。烟相渐销。鼻息成白。心开漏尽。诸出入息。化为光明。照十方界。得阿罗汉。世尊记我。当得菩提。佛问圆通。我以销息。息久发明。明圆灭漏。斯为第一。
When Sundarananda first left home and entered the Path under the Buddha, although he had fully received the precepts, his mind was constantly scattered and restless in meditative concentration (samādhi), and he had not attained the untainted fruit. The World-Honored One taught him and Kauṣṭhila to contemplate the breath at the tip of the nose turning white. Sundarananda contemplated for only twenty-one days before he saw that the incoming and outgoing breath in his nose was like smoke, and his body and mind were clear and bright within, able to perfectly and thoroughly perceive that the entire world had become empty and pure, translucent like crystal. Then the smoke-like appearance of the breath passing in and out of his nostrils gradually vanished and turned white. Within this samādhi, wisdom opened and afflictions were exhausted; all the breath entering and leaving from the tip of the nose transformed into light, illuminating the worlds of the ten directions, and he attained the fruit of an arhat. The World-Honored One predicted that he would in the future attain supreme bodhi. His dharma gate of perfect penetration was to dissolve the breath entering and leaving at the tip of the nose; after a long time, wisdom arose, and when it was perfected, afflictions were extinguished.
The meditative concentration (samādhi) achievement that Sundarananda attained was the fruit of contemplation through the manas, an achievement realized through cultivation and realization, not a result produced by the deliberation and analysis of the mind consciousness. No function of the mind consciousness can perceive the true reality and essence of things, and therefore it cannot produce results. The results come from the cultivation and realization of the manas, because the manas can perceive the true reality of things, perceive the true reality of the great thousand worlds, and perceive the empty nature of the five aggregates (pañca-skandha). These truths cannot be thought up by the mind consciousness's imagining, because the dharmas that the mind consciousness can contact are separated by a layer from the dharmas contacted by the manas, and are one layer more false. The manas is closely connected with the tathāgatagarbha; the dharmas it contacts are subjectively imagined realms with an underlying basis, coming directly from the essential realm, with no transitional dharma in between, whereas the dharmas contacted by the mind consciousness are manifested once again after the manas has contacted them. For the mind consciousness to perceive the true reality is extremely, extremely difficult; one can only rely on the manas.
I have not cultivated this dharma gate, so I cannot explain clearly the specific process of practice and its sublime results, but the general point of entry in practice is objective observation, without adding the mind consciousness's deliberation and analysis of the breath—use the manas's direct intuition to directly perceive the breath at the tip of the nose, gradually reaching single-pointedness, and with the equal cultivation of Samādhi and Prajñā, enter into samādhi. In any dharma gate of contemplative practice (vipaśyanā-caryā), once the mind consciousness's deliberation and other functions are activated, one is no longer in a state of contemplation; one has departed from the present state, become non-veridical, the results become untrustworthy, and no samādhi state arises. The more the mind consciousness is used, the greater the obstruction to the manas's contemplation, and the farther one is from the Path.
Therefore, to train the manas's contemplation, use the method of direct observation, extinguish the mind consciousness's deliberation, let the mind consciousness only play a guiding role, and leave the rest to the manas. The manas's contemplation is an objective and actual observation, without non-valid cognition or imagination divorced from reality; it can dominate the changes of states, letting states turn according to the mind rather than the mind turning according to states, thereby transforming body, mind, and world. The point of entry seems simple, but in fact the practice is difficult to accomplish. The reason is that there are too many people and matters that the mind is entangled with; the mind is so entangled that it cannot enter a quiet, single-pointed state of contemplative practice (vipaśyanā-caryā), and neither meditative concentration nor wisdom can appear, so of course there can be no talk of the fruit of cultivation and realization.
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