瑜伽論記 22.51

22.51

言如是戒等三學，當知是名學之邊際者，三學若滿，眾行悉圓，果行雖多，不過三學，故云邊際也。又云如是住者，此顯正方便，四種瑜伽所攝者，即是信欲精進慧名瑜伽，此即行體也。如是住三學者，此顯正行果者，三學是前四瑜伽果。此中信欲為先至方便者，是修三慧方便。

Regarding "such three trainings of morality and so forth should be known as the culmination of training": when the three trainings are fulfilled, the manifold practices are completely rounded; though the fruitional practices are manifold, they do not exceed the three trainings, hence it is called "culmination." Furthermore, it says: "abiding in this way"—this reveals the right expedient. "Subsumed under the four yogas" means that faith, aspiration, energy, and wisdom are called yoga; these are the substance of practice. "Abiding in this way in the three trainings"—this reveals the fruition of right practice; the three trainings are the fruition of the preceding four yogas. In this, "preceded by faith and aspiration" up to "expedient" are the expedients for cultivating the three wisdoms.