author
A Barnabite preacher and spiritual writer from eighteenth-century Italy, he became widely known for practical guidance aimed at easing fear, doubt, and scruples in the Christian life. His best-known work, Light and Peace, has remained in print because of its calm, encouraging tone.

by Carlo Giuseppe Quadrupani
Born in 1740 in Induno, in Lombardy, Carlo Giuseppe Quadrupani was an Italian Barnabite priest, preacher, and spiritual director. Sources describe him as a well-known preacher in Italy, and he also served as superior of St. Alessandro's in Milan and later as provincial of the Barnabites of Lombardy.
He is remembered above all for his devotional writing. His most famous book, Light and Peace—also published under longer titles about helping devout souls overcome doubts and fears—offers clear, gentle advice for people troubled by anxiety in the spiritual life. Readers have continued to return to it for its practical and reassuring approach.
Quadrupani died in 1806 or 1807; the exact year is not fully consistent across the sources I found. What is consistent is his reputation as a warm, steady guide for readers seeking simplicity, peace, and confidence in their faith.