大乘起信論裂網疏 2.87

2.87

此即本覺隨染分別所生淨智相也。雖由始覺所顯，不異在纏本覺，即是大乘相也。離煩惱、所知二障，即顯真如門中真實空義。本性清淨安住，即顯真如門中真實不空。為顯不空之相，故建立空，是故但名真實不空離障大義。此如無雲之太空、磨瑩之古鏡也。

This is precisely the mark of pure wisdom produced when original awakening accords with defilement and discriminates. Although revealed through initial awakening, it is not different from original awakening in entanglement; it is the attribute of the Mahāyāna. Being free from the two hindrances of afflictions and the knowable reveals the meaning of genuine emptiness within the aspect of tathatā. The original nature being pure and abiding reveals genuine non-emptiness within the aspect of tathatā. To reveal the mark of non-emptiness, emptiness is established; therefore it is simply named the great meaning of genuine non-emptiness free from hindrances. This is like the great sky without clouds, or an ancient mirror polished and shining.