首楞嚴義疏注經 1.299

1.299

此中立意，復宗歸內。最先所計心在身中，佛即推徵不合在內，以不能見身中物故。由此轉計身外潛根，及至窮研，二俱不當。再思理道，在內義長，遂立藏暗竅明，責無不見內過。七竅明露，五藏黯然，開竅緣明，合眼對暗，明暗若見，內外俱緣，由是在內決無所惑。

The intention established here is to return the thesis to the interior again. The very first proposition was that the mind is in the body, which the Buddha immediately investigated and refuted as not properly being inside, because it cannot see the objects inside the body. From this, he shifted to positing that it is outside the body or concealed within the faculties, but when thoroughly examined, both proved improper. Reconsidering the rationale, the meaning of being inside is stronger, so he posits that the organs are dark and the apertures bright, censuring the fault of not seeing the inside as absent. The seven apertures are openly exposed to light, while the five viscera are dark; opening the apertures conditions light, and closing the eyes faces darkness; if light and darkness are seen, both inside and outside are conditioned, and thus being inside is definitely without doubt.