Traditionalists, check your references. Reverend Banuchi's sandstone analogy was still nagging at me, and I realized it was because it reminds me of Psalm 118:

The stone which the builders refused

is become the head stone of the corner

Saint Peter repeats this image in his First Epistle:

4: Come to him, to that living stone, rejected by men but in God's sight chosen and precious;
5: and like living stones be yourselves built into a spiritual house, to be a holy priesthood, to offer spiritual sacrifices acceptable to God through Jesus Christ.
6: For it stands in scripture: "Behold, I am laying in Zion a stone, a cornerstone chosen and precious, and he who believes in him will not be put to shame."
7: To you therefore who believe, he is precious, but for those who do not believe, "The very stone which the builders rejected has become the head of the corner .... "

Note to Christian traditionalists relying on analogies about worthless stones: check your Scriptures first! The rejected stone in the Bible is Jesus!