妙法蓮華經玄義 3.148

3.148

增二數明行者，《阿含》云：「阿練若比丘，當修二法為行，謂修止、修觀。若修止時，即能休息諸惡，戒律威儀、諸行禁戒悉皆不失，成諸功德。若修觀時，即能觀苦，如實知之。觀苦集、苦盡、苦出要，如實知之，得盡漏，不受後有。怛薩阿竭亦如是修。」

Regarding explaining practice by increasing to the number two, the *Āgama* says: 'An araṇya monk should cultivate two dharmas as practice: cultivating calm (*śamatha*) and cultivating insight (*vipaśyanā*). When cultivating calm, he can put an end to all evils, and the disciplinary precepts, decorum, and all practices and restraints will not be lost, accomplishing all merits. When cultivating insight, he can contemplate suffering and know it as it really is. Contemplating the suffering, the accumulation of suffering, the cessation of suffering, and the escape from suffering, he knows them as they really are, attains the exhaustion of outflows, and does not receive further existence. The Tathāgata also cultivates in this way.'