Final answer:
In 1st Peter, Christians are described as 'living stones' who are meant to be a firm foundation in the world they live in. Christ, the cornerstone, can be a stumbling block for some people.
Step-by-step explanation:
In 1st Peter, Christians are described as 'living stones' in the world they live in. The Bible uses the metaphor of a cornerstone to illustrate that Christ is the foundation of the Christian faith. Just as a cornerstone is essential for the stability and integrity of a building, Christ is central to the beliefs and actions of Christians. However, the Bible also acknowledges that Christ can be a stumbling block for some people, meaning that His teachings and message may be challenging or difficult for them to accept.