楞伽阿跋多羅寶經註解 1.702

1.702

「云何無二？謂一切法如陰熱、如長短、如黑白。大慧！一切法無二，非於涅槃彼生死，非於生死彼涅槃，異相因有性故，是名無二。如涅槃、生死，一切法亦如是。是故空、無生、無二、離自性相應當修學。」

"What is non-duality? It means that all dharmas are like light and shadow, like long and short, like black and white. Mahāmati, all dharmas are non-dual: nirvāṇa is not in saṃsāra, and saṃsāra is not in nirvāṇa; because of their distinct characteristics, they have nature depending on each other. This is called non-duality. Just as it is with nirvāṇa and saṃsāra, so it is with all dharmas. Therefore, one should train in emptiness, non-arising, non-duality, and the characteristic of being free from self-nature."