Luke 20:18

Whosoever shall fall on that stone, shall be
broken,
&c.] Not who shall fall upon Christ by faith, and build upon him as the foundation stone, for such shall be saved; but that stumble at him, and are offended with him, and fall by unbelief and hardness of heart; such do themselves much hurt and mischief and expose themselves to danger and ruin; they bid very fair for destruction:

but on whomsoever it shall fall;
as it did with its full weight upon the Jews at their destruction, and as it will upon all Christless sinners at the last day:

it will grind him to powder;
the ruin of such will be unavoidable, and there will be no recovery; (See Gill on Matthew 21:44).