In Matthew 11 we learn that John the Baptist,  the herald of the Messiah who Jesus said was the greatest man ever born, began to doubt if Jesus really was who He claimed to be. If even John's faith in Jesus could falter then who is immune to doubt? No one is. Every believer wrestles with doubt, usually many times; so there is an important question we all need answered. If our salvation is by faith alone, how does Jesus respond to doubters?