金剛經纂要刊定記 6.61

6.61

釋非心。經徵意云：所以說諸心為顛倒識無體者。何謂也？釋意云：以於過現未來求不得故。

Explaining "not mind": the sūtra raises the question, meaning: for what reason are the various minds explained as inverted consciousness without substance? The explanation means: because they cannot be found in the past, present, or future.