瑜伽師地論略纂 6.7

6.7

「於三摩地退時顛倒」者，修進無漏，趣退有漏時，謂顛倒。後二退時謂退，名為無倒。初於有漏定實退時謂退，後於無漏定退有漏時謂退。　於有漏定退時謂退中，文有三復次：一、由愛味故退；二、由慢毀故退；三、由貪誑故退。「第二無倒，翻初無倒，應知其相」者，謂得無漏定，將失有漏定時，如實知退，是名無倒。第三無倒，退時知退。第四無倒，無漏進時，知有漏退。此中，第四與前第二有差別者，前修無漏方便猶未證得，謂退曾得定；今第四正得無漏，有漏不行，謂之為退：故成差別。

Regarding "error at the time of regression in samādhi": cultivating advancement in the undefiled and heading toward regression in the defiled is called error. In the latter two, taking regression to be regression is called non-error. The first takes actual regression in defiled concentration to be regression; the second takes regression from the defiled in undefiled concentration to be regression. In taking regression to be regression in defiled concentration, the text has three occurrences: first, regression due to attachment to taste; second, regression due to conceit and depreciation; third, regression due to greed and deceit. Regarding "the second non-error should be known in its marks as the reverse of the first non-error": when one attains undefiled concentration and is about to lose defiled concentration, knowing regression as it truly is is called non-error. The third non-error is knowing regression at the time of regression. The fourth non-error is knowing defiled regression when the undefiled advances. Here, the distinction between the fourth and the preceding second is that previously, in the expedient stage of cultivating the undefiled, one had not yet realized it and took it to be regression from previously attained concentration; now, in the fourth, one actually attains the undefiled and the defiled does not operate, which is called regression: thus the distinction is made.