大方廣圓覺修多羅了義經略疏 2.1120

2.1120

二、別明心相。此同《金剛經》中具四心也，四心者，彼經彌勒頌云：「廣大第一常，其心不顛倒。」今此文二，文二合故：一、廣大第一。

Second, separately clarifying the characteristics of the mind. This is identical to possessing the four minds in the Vajracchedikā-sūtra. Regarding the four minds, Maitreya's verse in that sūtra states: 'Vast, supreme, constant, its mind is not inverted.' Now this text has two parts, combining the pairs: 1. vast and supreme.