While serving his church in Boston, Lincolnshire, John Cotton preached a sermon series on First John. The exposition was so impactful that, in 1651, he thought it beneficial to publish his sermons on 1 John 5:12-17 under the title Christ the Fountain of Life. What makes Fountain so timeless is its beautiful and detailed focus on the person of Jesus Christ, as well as the fullness and assurance of life enjoyed by all true believers.