The Personal Heresy by C. S. Lewis and E. M. W. Tillyard. The Personal Heresy is a collection of six essays authored by C. S. Lewis and E. M. W. Tillyard. Three by each author. In this book C. S. Lewis is supporting the viewpoint that the author's own personality has meager or no impact on his or her imaginative writings on the contrary the outer world or the environment affects one's creative or imaginary writings dominantly. On the other hand, E. M. W. Tillyard is supporting the viewpoint that the author's own imagination has a major impact on his or her imaginative or creative writing.