摩訶止觀 2.4

2.4

First, constantly sitting: this derives from the two Prajñāpāramitā sūtras, 'Spoken by Mañjuśrī' and 'Questioned by Mañjuśrī', and is called the one-practice samādhi. Now, we first explain the method, and next explain the exhortation to cultivate it.