Coming to Him as to a living stone, rejected indeed by men, but chosen by God and precious… – 1 Peter 2:4

The union between Christ and the believer is described as the union of the foundation and the stone. “To whom coming, as unto a living stone, disallowed indeed of men, but chosen of God, and precious, ye also, as lively stones, are built up a spiritual house.” We are built on Christ and built up into Him. We lie upon Him just as the stone rests on the foundation. The stone is one with the foundation in its dependence. In the time of our need we press the closer to Christ; the heavier our hearts, the more we bear our weight upon Him. It is the heavy stone that clings to the foundation; the light stone, perchance, might be blown away. But we cling at all times, depending wholly upon Him, even as the stone rests upon the rock beneath. The stone does not bear up its own weight: it just rests where it is put. So do we rest on Christ. He is the foundation, and we repose on Him.

In old Roman walls, you cannot get a stone away; for the cement, which joins the stone to its fellows is as strong as the stone itself; and, truly, that which joins us to Christ is stronger than we are. We might be broken, but the bond of love, which holds us like a mighty cement to Christ, who is our foundation, can never be broken away. We have actually become one with Him, as I have often seen stones in the walls of an old castle become one with each other. You could not get them away; they are part and parcel of the wall, and it would have been necessary to blow the wall to pieces before you could separate the stones from one another. So have we, by God’s grace, become one with Christ, experimentally and indissolubly. The course of years has bound us still faster to Him. ~ C.H. Spurgeon

https://www.blueletterbible.org/comm/spurgeon_charles/sermons/2244.cfm