At their beginnings, Jesuits had a huge impact on the Catholic Church in Poland. They introduced the Council of Trent reform and stopped the spread of Protestanism. Amongst them, there were many mystics, great theologians, missionaries, saints and priests. One of them was Father Kasper Druzbicki, theologian, ascetic writer, preacher and administrator. One of his many theological works is a treaty about the shortest way to Christian perfection, which is God’s will fulfillment. The book is not just designed for those in consecrated life, but also in secular life who strive toward holiness.