" Revival occurs as a group of people who, on the whole, think they already know the gospel discover they do not really or fully know it, and by embracing the gospel they cross over into living faith. When this happens in any extensive way, an enormous release of energy occurs. The church stops basing its justification on its sanctification. The nonchurched see this and are attracted by the transformed life of the Christian community as it grows into its calling to be a sign of the kingdom, a beautiful alternative to a human society without Christ. "

― Timothy J. Keller , Center Church: Doing Balanced, Gospel-Centered Ministry in Your City