There must be patient continuance in preaching and teaching the truth, if we want good to be done. Christ must be set forth again and again as the “Lamb of God who takes away the sin of the world”. The story of grace must be told repeatedly, line upon line and precept upon precept. It is the constant dripping which wears away the stone. The promise shall never be broken that “God’s Word shall not return to Him void” (Isaiah 55.11). But, it is nowhere said that it shall do good the very first time that it is preached. It was not the first proclamation of John the Baptist, but the second, which made Andrew and his companion follow Jesus. – J. C. Ryle (1816-1900), commenting on John 1.29-37.