Teresa of Avila was a sixteenth-century Carmelite nun who was committed to a life of contemplative prayer. Beloved for both her deep spiritual insights and practical approach to life, her writings are considered spiritual classics, and The Interior Castle is widely recognized as her literary masterpiece. To read The Interior Castle is to put yourself in the hands of an extraordinarily qualified faith mentor who well understands our struggles to connect with God. Teresa’s primary metaphor throughout this work is that the human soul is an “interior castle,” or a series of “dwelling places,” of great grandeur, beauty, and value. Her book is a tour of the different ways we relate to God through prayer, with varying intensity, awareness, and intimacy, culminating with spiritual unity with God. Many books on prayer are about what we do to pray, or to pray better. But there are relatively few, like The Interior Castle, that focus on what God does in prayer—particularly the sometimes…