金剛經纂要刊定記 5.120

5.120

不動。經意云：此經深妙難解難知，或有人聞多生驚畏，若得不生驚畏，豈不希有者哉。實難其人蓋緣經勝，經勝之義昭然可知。

Unmoving. The intent of the sūtra is: this sūtra is profound and wondrous, difficult to understand and difficult to know; if some people hear it, they mostly give rise to alarm and fear; if they can avoid giving rise to alarm and fear, is that not rare? Such a person is truly rare because of the sūtra's superiority; the meaning of the sūtra's superiority is clearly evident.