This book investigates the theological pathway and practical application for achieving 'entire sanctification' within the Christian faith. Drawing upon scriptural interpretation and theological reasoning, Wilson outlines a method for seekers to attain a state of complete spiritual purity and devotion. The work serves as a guide for individuals committed to a deeper, more consecrated Christian life.

Published in 1894, 'The King's Highway' likely reflects the theological discussions and spiritual movements prevalent in late 19th-century American Protestantism, particularly concerning Wesleyan-Holiness doctrines. Its focus on a direct, divinely-guided path to spiritual perfection suggests it was intended for earnest believers seeking a more profound experience of faith. The title itself implies a clear, authoritative direction for spiritual progress.