Baxter was always plain spoken to sinners: "Whoever loves earth above Heaven, and fleshly prosperity more than God, is a wicked, unconverted man!" In the 17th century not only was he the most voluminous author of his day (72 volumes), but also his shepherding of his flock at Kidderminster was so phenomenal that it stands as a marker for all other pastors and evangelists. He practiced what he teaches in this book. The host of conversions under his preaching testifies to the power of the message in A Call.