金剛經纂要刊定記 1.93

1.93

故云胸談等，若將源派約迷不迷，前後相望有其四句。一、迷源不迷派，即配入名相者。二、迷派不迷源，即但云一真者。三、源派俱迷，即胸談臆注也。四、源派俱不迷，即下不攻異端，是此疏也。

Therefore it says "speculating from the heart," and so forth. If we take source and streams in terms of being bewildered or not bewildered, viewing them in mutual relation yields four propositions: 1. Bewildered about the source but not bewildered about the streams: this is matching with technical terms. 2. Bewildered about the streams but not bewildered about the source: this is merely speaking of the single true. 3. Bewildered about both source and streams: this is speculating from the heart and commenting on whim. 4. Bewildered about neither source nor streams: this is "not attacking divergent extremes" below, which refers to this commentary.