起信論疏筆削記 20.24

20.24

However, what was explained above clarified the mental marks of the three contemplations according to the sūtras, which seem to constitute distinct differences. In the practitioner, however, the three knowledges must be attained within the One Mind—neither longitudinal nor transverse, neither combined nor separate—before it is complete cultivation. Tiantai's contemplation of emptiness is this gate of calming (śamatha); the provisional contemplation is the gate of contemplation (vipaśyanā); and the contemplation of the Middle Way is their concurrent operation. This is roughly how it is.