Come to him, a living stone, though rejected by mortals yet chosen and precious in God’s sight, and like living stones, let yourselves be built into a spiritual house, to be a holy priesthood, to offer spiritual sacrifices acceptable to God through Jesus Christ. For it stands in scripture: “See, I am laying in Zion a stone, a cornerstone chosen and precious; and whoever believes in him will not be put to shame.” To you then who believe, he is precious; but for those who do not believe, “The stone that the builders rejected has become the very head of the corner,” and “A stone that makes them stumble, and a rock that makes them fall.” They stumble because they disobey the word, as they were destined to do. But you are a chosen race, a royal priesthood, a holy nation, God’s own people, in order that you may proclaim the mighty acts of him who called you out of darkness into his marvelous light. Once you were not a people, but now you are God’s people; once you had not received mercy, but now you have received mercy. (1 Peter 2:4-10, NRSV)
The cornerstone is the base of everything. It is the stone that holds the wall in place.
It gives the base for the walls to be square and to stand tall.
And if you believe in the corner stone you will not be put to shame. It is believing in what the cornerstone will do for you and your life.
So base your life on Christ and allow Him to hold you steady.