摩訶止觀 1.91

1.91

「推理發心」者：法性自天而然，集不能染，苦不能惱，道不能通，滅不能淨。如雲籠月，不能妨害；却煩惱已，乃見法性。經言：「滅非真諦，因滅會真。」滅尚非真，三諦焉是？煩惱中無菩提，菩提中無煩惱。是名「推生滅四諦上求佛道下化眾生發菩提心」。

"Giving rise to the aspiration by investigating the principle": the dharmatā is naturally so from Heaven; accumulation cannot defile it, suffering cannot distress it, the path cannot penetrate it, cessation cannot purify it. It is like clouds cloaking the moon, yet unable to harm it; only after casting off the defilements does one see the dharmatā. A sūtra states: "Cessation is not the true truth; through cessation one tallies with the true." If even cessation is not the true, how could the [other] three truths be so? Within defilement there is no bodhi; within bodhi there is no defilement. This is called "giving rise to the bodhicitta by investigating the four truths of arising and perishing to seek the Buddha path above and transform sentient beings below."