摩訶止觀 6.7

6.7

One contemplates this mind of desire: does it arise from the sense organ? Does it arise from the sense object? Does it arise from both combined? Does it arise apart from them? If it arises from the organ, then when not facing an object, the mind should arise of itself. If it arises from the object, then since the object belongs to the other, what has it to do with me? If it arises from both combined, two minds should arise. If it arises without a cause, arising without a cause is impossible. When investigating desire through the four tetralemma options, desire has no place of origin; since it has no place of origin, it also has no place to go. There is no desire and no tetralemma; without coming and without going, it is ultimately empty and tranquil. When a person of sharp faculties contemplates like this, one grade of the provisionality of thought is removed, and one portion of the true is clearly manifested. Even if one does not yet correspond [with truth], by employing the four siddhāntas, alternating between faith and Dharma, and skillfully harmonizing calming and contemplation, one will then attain correspondence; severing one grade of thought manifests one portion of the true, and so on.