In this fourth volume, Fr Paul Brendan Murray, OP, explores how four great saints—Augustine of Hippo, Teresa of Avila, Thomas Aquinas, and Thérèse of Lisieux—navigated the challenges of prayer. Through their struggles and insights, he offers encouragement to those who long to grow in their spiritual life but face distractions, doubts, and human weakness. Their experiences provide practical guidance and inspiration for anyone seeking to deepen their prayer life.