Padre Quadrupani was an Italian priest and member of the Clerics Regular of St. Paul, also known as the Barnabites, from their association with St. Barnabas Catholic Church in Milan, Italy. Quadrupani's spirituality is based on that of the illustrious Doctor of the Church, St. Francis de Sales (1567-1622). Like St. Francis, the Padre offers spiritual advice that is practical and balanced. Perhaps it is owing to this that Quadrupani's treatise has been so well received by Catholic laypersons and has been recommended by numerous bishops over the years. This English edition, Light and Peace, is introduced by The Most Rev. Patrick John Ryan, Archbishop of Philadelphia, and bears an imprimatur. It is generously augmented with excerpts from the writings of St. Francis de Sales, St. Augustine, St. Thomas Aquinas, St. Bernard, Pope St. Gregory the Great, St. Philip Neri, Archbishop Francois Fenelon, Father Lorenzo Scupoli, and other spiritual authorities.