大乘起信論義記 2.194

2.194

所言不覺義者，謂不如實知真如法一故，不覺心起而有其念，念無自相不離本覺。

“What is called the meaning of non-enlightenment is that, because one does not truly know the oneness of the dharma of tathatā, the non-enlightened mind arises and there is thought; thought has no self-mark and is not separated from innate enlightenment.”