The Christian life is not sustained by willpower alone. It is sustained by grace. In the Rosary, the soul is placed again and again before the mysteries of Christ with Mary, and through this prayer God strengthens, purifies, and gradually conforms us more deeply to his Son.
The Catechism of the Catholic Church teaches that prayer is a battle. We are the Church Militant on earth, and the Rosary is not merely a devotion of comfort, but a help in spiritual combat. It helps the faithful persevere in grace, resist evil, and remain fixed on Christ through the maternal aid of Our Lady.
For that reason, the Rosary belongs not only to moments of peace, but also to moments of temptation, confusion, weariness, and trial. It trains the soul to return to Christ faithfully until grace has done its work more deeply in us.