大乘起信論裂網疏 6.128

6.128

觀生滅即真如，名止。生死本空，何可樂著？生死無性，何須怖畏？觀真如即生滅，名觀。因果宛然，安得不勤修善？同體在迷，安得不普濟度？蓋一心二門本不相離，故一心止觀決不可偏修也。為成無上菩提，所以二行作一門說。初正示修習信心竟。

Contemplating arising and ceasing as identical to tathatā is called calm abiding. Saṃsāra is fundamentally empty, how could one take pleasure in and cling to it? Saṃsāra lacks intrinsic nature, why must one fear it? Contemplating tathatā as identical to arising and ceasing is called special insight. Causes and effects are clearly apparent, how could one not diligently cultivate the good? Being of the same essence yet in delusion, how could one not universally deliver them? Because the two aspects of the one mind are fundamentally inseparable, calm abiding and special insight of the one mind must never be cultivated one-sidedly. In order to accomplish unsurpassed bodhi, these two practices are spoken of as a single approach. The first part, directly indicating the cultivation of the faithful mind, is concluded.