金剛經纂要刊定記 4.17

4.17

疏答問中科安住等者。此即安住四心。彌勒偈云：「廣大第一常，其心不顛倒，利益深心住，此乘功德滿。」依此科判，故列四心也。

Regarding the commentary's "In answering the question, dividing into 'peacefully abiding,' etc.": this refers to peacefully abiding in the four minds. Maitreya's verse says: "Vast, supreme, eternal, / their mind is not inverted; / abiding in the deep mind of benefiting, / the merits of this vehicle are complete." It is according to this outline and classification that the four minds are listed.