大毘盧遮那成佛經疏 2.4

2.4

經云「自然」者，謂一類外道計一切法皆自然而有，無造作之者。如蓮花生而色鮮潔，誰之所染？棘刺利端，誰之所削成？故知諸法皆自爾也。有師難云：「今目覩世人造作舟船室宅之類，皆從眾緣而有，非自然成，云何自爾耶？若謂雖有而未明了，故須人功發之，是亦不然。既須人功發之，即是從緣，非自然有也。」

The sūtra says: “Spontaneity.” This refers to a class of non-Buddhists who impute that all dharmas exist spontaneously and have no creator. Just as when a lotus is born, its color is fresh and pure—who dyed it? The sharp tip of a thorn—who carved it? Thus they know that all dharmas are naturally so. A master refuted this, saying: “Now, seeing with our eyes people in the world building boats, houses, and the like, all exist from multiple conditions and are not formed spontaneously; how can they be naturally so? If one says that although they exist, they are not yet evident, and therefore require human effort to bring them forth, this too is not correct. Since they require human effort to bring them forth, they depend on conditions and do not exist spontaneously.”