摩訶止觀 7.175

7.175

次入初住，破無明見佛性。《華嚴》云：「初發心時便成正覺，真實之性不由他悟。」即此意也。

Next, one enters the first dwell-abode, breaks through avidyā, and sees the Buddha-nature. The Huayan says: 'At the time of first arousing the mind, one immediately achieves correct enlightenment; the nature of true reality is not awakened through another.' This is precisely the meaning.