金剛經纂要刊定記 1.75

1.75

"Severing twenty-seven doubts": According to Vasubandhu's treatise, once the Buddha finishes answering the three questions, he immediately follows their trail to sever doubts, down to the end of the sūtra in twenty-seven sections. That is, the first is the doubt about seeking Buddhahood and practicing giving while abiding in marks, down to the twenty-seventh, the doubt about how the Dharma can be expounded upon entering quiescent extinction.