Jeff Mangum teaches on our identity in Christ form 1 Peter 2:7-10.
So the honor is for you who believe, but for those who do not believe,
“The stone that the builders rejected
has become the cornerstone,”
“A stone of stumbling,
and a rock of offense.”
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, a people for his own possession, that you may proclaim the excellencies 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: 7-10