Written in 1577 by the Spanish mystic and Doctor of the Church, The Interior Castle is a luminous guide to the spiritual life. Teresa of Ávila invites you to imagine your soul as a magnificent crystal castle, filled with many rooms. The journey inward—through seven sets of mansions—leads from the outer courtyard of self‑knowledge to the innermost chamber where God dwells. This modern-English edition presents Teresa's timeless wisdom in clear, inviting language, preserving her warmth, candor, and practical advice on prayer, humility, and perseverance. Whether you are new to contemplative spirituality or a seasoned seeker, these pages offer a gentle yet profound map for deepening your relationship with the Divine. The book is educational and not a substitute for personalized spiritual direction. Part of The Modern Wisdom Library.