請觀音經疏闡義鈔 2.51

2.51

「約此」下，類通三法，略舉三種，應知一切三法皆三因之異名。「四位」者，「位」應作「教」，字之誤也，下文放此。

From "in terms of this" downward applies this analogously across the three dharmas, briefly mentioning three kinds; one should know that all sets of three dharmas are different names for the three causes. "Four positions": "position" should read "teaching," which is a textual error; the text below follows this.