And coming to Him as to a living stone which has been rejected by men, but is choice and precious in the sight of God, you also, as living stones, are being built up as a spiritual house for a holy priesthood, to offer up spiritual sacrifices acceptable to God through Jesus Christ.
1 Peter 2:4-5

This is a call to be temple – a living temple – a living place of worship. This is the call to step into the role of priests. As you read through 1 Peter, you notice that prior to this call to be "living stones" Peter calls Christians to live as "obedient children" and "newborn babes." One of the most important things we note about this third metaphor is that you can live as an obedient child individually; and you can live as a newborn babe individually; but you cannot be living stones that are being built into a spiritual house unless other stones are involved. Even though the emphasis all along has probably been on the corporate nature of being a disciple of Jesus, it now becomes imperative. A living stone cannot be built into a spiritual house all by itself – it is the purpose of the Church, the body of Christ, to house this holy priesthood. It is the purpose of the Church to offer up spiritual sacrifices acceptable to God through Jesus Christ. This necessarily makes this section missionary and evangelistic. The only way to build up the house is by constantly adding more living stones!

Hal Linhardt preached one of the most powerful and significant sermons on evangelism I have ever heard. The notes (For some reason I couldn't get the command to publish a link to work, so I'll just do it the ugly way - if you want to read the notes for Hal's sermon go to this link http://www.ihop.org/Group/Group.aspx?ID=1000000380) for his sermon are nothing more than a list of scriptures that demand and motivate Christians to give up the fear of man and begin to rescue people from the jaws of hell. It is time for believers in Jesus to step into our role as living stones and minister to God in worship, to represent God to lost people, and to intercede on behalf of those lost people before the throne of God.