Now to you who believe, this stone is precious. But to those who do not believe, "The stone the builders rejected has become the capstone," and, "A stone that causes men to stumble and a rock that makes them fall." They stumble because they disobey the message—which is also what they were destined for.There is so much I would love to say about this passage. Jesus Christ has become such a foundation for me. I have learned to identify with so many of the Psalms that say, "He is my Rock... He is my Fortress..." but He has also been such a stumbling block to me when I was young. I have seen both aspects of this stone in my life.
The other day I heard a preacher mention this aspect of the capstone, how much effort it would have taken to keep all of the stones in place, until the capstone was set in place. Then everything holds together. The capstone makes everything right.