We can't know at any given time how God will bless our faithful witness. So the apparent numerical growth of the church is never a good guide to how faithful we have been in evangelism.
Mark DeverWe live in a time when people are increasingly skittish about evangelism - Christians and non-Christians alike. People are suspicious of evangelism, and misunderstand it, which contributes to our reluctance to share the gospel. When you add our fear of others' reactions as well as our natural laziness to the equation, it's not hard to see why we make such little progress in sharing our faith.
Mark Dever