For nearly 2,000 years, Christian mystics, martyrs, and sages have documented their search for the divine. Their writings have bestowed boundless wisdom upon subsequent generations. But they have also burdened many spiritual seekers. The sheer volume of available material creates a seemingly insurmountable obstacle. Enter the Upper Room Spiritual Classics series, a collection of authoritative texts on Christian spirituality curated for the everyday reader. Designed to introduce 15 spiritual giants and the range of their works, these volumes are a first-rate resource for beginner and expert alike. William Law's classic book, A Serious Call to a Devout and Holy Life, excerpted in this volume, shows the joy and worth of a disciplined life. Law offers extensive advice for those who are dedicated to holy living and shows how daily prayer can shape the rest of our lives into praise to God and love for neighbor.