This study of the apologetics of the widely known late English university don is drawn from a doctoral dissertation. The author is convinced that preachers, theologians, and apologists can learn much from Lewis for their task of defending and spreading the Christian faith. Acknowledging the justice of the criticisms of his subject's theology, he replies that Lewis was able to write in such a way that men believed him and were changed. He restates Lewis' own goals for his apologetics, first among which was the effort to present the Christian faith to unbelievers--a point often overlooked by those critics who chide him for his inadequate theology or misuse of traditional Christian terminology. The story of Lewis's life is summarized and interpreted to show how he came to be the influential writer that he was. The intellectual strand in his thought, so sharply at odds with Barthian scorn of reason, is well defined, as is his insight into the whole of the modern cultural scene. But chief factor in his power to influence others the author finds in the way he showed himself to be a man ""consumed with care or concern."" For the wide span of Lewisan readers as well as for theologians, clergy, and those involved in the task of carrying on Christian apologetics.