瑜伽論記 18.23

18.23

前中，謂由四義故於諸明處內明為勝。一、攝四諦故；二、即四諦義非外道所伏故；三、即四諦義煖等易曉故；四、既入諦理八正不壞故，或四不壞信清淨故。

Within the former part, it means that by virtue of four reasons, inner knowledge is supreme among all fields of knowledge: 1. because it subsumes the four truths; 2. because the meaning of the four truths cannot be subdued by non-Buddhists; 3. because the meaning of the four truths is easy to comprehend at [the stages of] warmth and so on; 4. because having entered into the principle of the truths, the eightfold noble [path] is indestructible, or because the four indestructible confidences are purified.