諸經要集 2.42

2.42

Furthermore, the Vibhāṣā says: Just as when a person looks at the sun their eyes are not clear and bright, so when one contemplates and seeks non-Buddhist books and treatises, it causes the eye of wisdom not to be clear. Just as when a person looks at the moon their eyes are clear and bright, so when one contemplates and seeks Buddhist sūtras and treatises, it causes the eye of wisdom to be clear and bright. If one contemplates and seeks worldly, external texts, it is like striking a macaque—only filth comes out. If one contemplates and seeks the Buddha's Dharma, it is like refining pure gold—the more it is refined, the purer it becomes.