十不二門指要鈔 2.143

2.143

三、故重下，明重述觀行易明。將彼十妙無邊法相，攝作十門不離一念，令修觀者可識，作者再三顯示何以迷之。

Third, from "therefore restating" onward, clarifying that restating the contemplative practice makes it easy to understand. Taking those boundless dharma marks of the ten subtleties and gathering them into ten gates without departing from a single thought-moment, so that those cultivating contemplation can recognize them—the author showed this repeatedly, so how could one be deluded about it?