Walk in the Light Centuries ago, the apostle John wrote to new believers to instruct them in how to live godly lives. Today, John's words still hold truth and power as we struggle and triumph in our desire to "walk in the light" with God and others. 1,2,3 John: How Should a Christian Live? invites us to grow in maturity as God's children while we learn more about what it means to live a radically transformed life.