C.S. Lewis is one of the modern Christianity’s greatest writers. Whether a pastor or a layperson, believers have sought counsel with Lewis regarding depression, spiritual warfare, or simply to increase their faith in Jesus. His most famous works, including Mere Christianity andThe Screwtape Letters, are appreciated for their humor and defense of the Christian faith. However, in recent years, his work The Abolition of Man has not received attention like his other, more accessible writings. Christians should heed Lewis’ warnings against the rising tide of relativism that is sweeping the world.