The Venerable Louis of Granada, OP (1504 - 1588), was a Dominican friar who was a noted theologian, writer and preacher.

He is best known for his ascetical writings of which The Sinner's Guide has achieved the greatest success. It was published in 1555 and quickly became a classic being translated into Italian, Latin, French, German, Polish, and Greek. He earned much money for his writings, all of which went to the poor. The work has been compared with Thomas à Kempis's The Imitation of Christ.

St. Teresa of Avila said this book converted over one million people in her day. St. John of the Cross, St. Francis de Sales, St. Charles Borromeo, St. Vincent de Paul, and St. Rose of Lima, all claimed it as a favorite of theirs.

This app version is linked to the World English Bible.