瑜伽論記 13.407

13.407

若於引發緣中勢自在等者，（景云：）加行善種及無記種一分善，唯習者遇緣引發，勢力自在，假立為得，即是自在得。

On the passage stating, "If regarding the conditions that induce it, its power has mastery," and so forth—Jing says: The seeds of preparatory wholesome dharmas and the wholesome portion of unrecorded seeds are induced upon encountering conditions solely by those who have practiced them; their power has mastery, and this is provisionally designated as attainment—that is, the attainment of mastery.