"The All-Sufficiency of Christ" is a book written by Charles Henry Mackintosh, a 19th-century Christian preacher and writer. In this work, Mackintosh likely explores the central theme of the sufficiency of Jesus Christ for the believer's salvation, sanctification, and every aspect of their Christian life. Mackintosh was known for his evangelical writings and his emphasis on the foundational truths of Christianity. In "The All-Sufficiency of Christ," he likely delves into topics such as the uniqueness of Christ as the Savior, the completeness of His work on the cross, and the believer's reliance on Him for spiritual growth and victory over sin.