St. Vincent de Paul taught that the virtue of mortification, or self-discipline and denial of worldly desires, was essential to following Christ and establishing His kingdom. He urged Christians to constantly cut away evil tendencies through mortification, using the analogy of a vine-dresser pruning away harmful branches. St. Vincent encouraged his missionaries to perform acts of mortification daily and overcome themselves by submitting their will, judgment, and senses to God in order to walk the narrow path that leads to life with Jesus Christ.