南宗頓教最上大乘摩訶般若波羅蜜經六祖惠能大師於韶州大梵寺施法壇經 1.25

1.25

"Now that this is so, in this Dharma door, what is called sitting in meditation? In this Dharma door, everything is unobstructed: outwardly, not having thoughts arise toward any sensory realm is sitting; seeing the original nature without disturbance is meditation. What is called dhyāna-samādhi? Outwardly being detached from forms is called dhyāna; inwardly being undisturbed is called samādhi. If one is outwardly detached from forms, the inner nature will not be disturbed. The original nature being naturally pure is called samādhi; it is only because of contact with realms that contact brings disturbance, and detachment from forms without disturbance is samādhi. Outwardly being detached from forms is dhyāna; inwardly being undisturbed is samādhi. Outward dhyāna and inward samādhi—therefore it is called dhyāna-samādhi. The Vimalakīrti Sūtra says: 'Suddenly and completely, one regains one's original mind.' The Brahmā Net Bodhisattva Precept Sūtra says: 'The original source of one's own-nature is pure.' Kalyāṇamitras! See that your own-nature is inherently pure; cultivate yourself and make your own-nature dharmakāya; practice the Buddha's conduct yourself, and accomplish the Buddha Way yourself."