首楞嚴義疏注經 5.117

5.117

一切世間色心染淨諸有境界，皆依無明而得住持，今無明已變成明，明即一切種智。佛既證得一切境界，有何難了？是故即能皆了元由。

All the realms of form and mind, defilement and purity, existence and non-existence in all worlds are maintained in reliance on avidyā. Now avidyā has been transformed into clarity, and clarity is the knowledge of all aspects. Since the Buddha has realized all realms, what could be difficult to comprehend? Therefore he is able to completely comprehend their primal origins.