大般涅槃經集解 56.28

56.28

案僧亮曰：以取刀之知，並通難也。雖取刀照面，刀本無面；豈以取乳為酪，而言乳已有酪耶？寶亮曰：此中有四重難：第一，眼光到境乃見，則火應燒眼。第二，若至境而見，不應生疑。第三，眼光是色，水亦是色，二俱是礙，唯可見水，云何乃見水中魚石耶？第四，防難。若言不到故見，何故不見壁外物耶？

Sengliang comments: He uses the understanding that takes the mirror [or sword] to resolve all objections. Although one takes the blade to reflect one's face, the blade originally has no face in it. How could one, just because one takes milk to make curd, claim that the milk already contains curd? Baoliang comments: Herein are four levels of objections: First, if the visual faculty's light reaches the object and only then sees, then fire should burn the eye. Second, if one sees by reaching the object, doubt should not arise. Third, the visual light is material form (rūpa), and water is also material form; both are obstructive. One should only be able to see the water—how could one see the fish and stones within the water? Fourth, preventing an objection: if one says one sees because it does not reach, why does one not see objects on the other side of a wall?