金剛經纂要刊定記 5.273

5.273

無佛疑者。若了虛無之無，無即無咎，執之為無，無則太傷，故成此疑。後法亦然也。

The doubt of there being no Buddha: if one understands the non-existence of voidness, non-existence has no fault; if one grasps it as non-existence, non-existence is overly destructive—hence this doubt arises. The subsequent phenomenon is also like this.