金剛經纂要刊定記 4.281

4.281

不空等者。謂持說此經不同寶施，空得福德更得何物？次文是也。

[On the passage] "Not empty...": this means upholding and expounding this sūtra is unlike the giving of treasures, where one emptily gains merit and what else does one obtain? The subsequent text confirms this.