Every believer should evangelize. I know some Christians think that evangelism is only for people with special gifts for it, but I don't believe the New Testament teaches that. While Paul does say that some believers have the call to be evangelists, all of us have the responsibility of evangelism.

God can use even stray, honest comments to bring people to himself.

When a person becomes a Christian, he doesn’t just join a local church because it’s a good habit for growing in spiritual maturity. He joins a local church because it’s the expression of what Christ has made him—a member of the body of Christ.

I think it's unhelpful to suggest that the task of evangelism is essentially the responsibility of ministers.

Christian proclamation might make the gospel audible, but Christians living together in local congregations make the gospel visible (see John 13:34-35). The church is the gospel made visible.

Advice on evangelism needs to be tailored to individual situations. For instance, I know someone who needs to be encouraged to speak less and work more. That would be a better testimony for him because he has certainly let his work colleagues know about Jesus. It's not that I don't want him to witness about Jesus, but I have a lot of sympathy for his employer. He is paying for work to be done.

As long as quick numerical growth remains the primary indicator of church health, the truth will be compromised. Instead, churches must once again begin measuring success not in terms of numbers but in terms of fidelity to the Scriptures.