Stumbling: Stone of

And He will be a sanctuary—but to both houses of Israel a stone of stumbling and a rock of offense, to the dwellers of Jerusalem a trap and a snare.

Why not? Because their pursuit was not by faith, but as if it were by works. They stumbled over the stumbling stone,

…as it is written: “See, I lay in Zion a stone of stumbling and a rock of offense; and the one who believes in Him will never be put to shame.”

Though you have not seen Him, you love Him; and though you do not see Him now, you believe in Him and rejoice with an inexpressible and glorious joy,