Speaking about the power of Christ to redeem sinners and build his church, Russell Moore recently (2015) wrote:

The next Billy Graham might be drunk right now. The next Jonathan Edwards might be the man driving in front of you with the Darwin Fish bumper decal. The next Charles Wesley might currently be a misogynistic, profanity-spewing hip-hop artist. The next Charles Spurgeon might be managing an abortion clinic today. The next Mother Teresa might be a heroin-addicted porn star this week. The next Augustine of Hippo might be a sexually promiscuous cult member right now, just like, come to think of it, the first Augustine of Hippo was.

But the Spirit of God can turn all that around. And seems to delight to do so. The new birth doesn't just transform lives, creating repentance and faith; it also provides new leadership to the church, and fulfills Jesus' promise to gift his church with everything needed for her onward march through space and time (Eph. 4:8-16).