Mystery will introduce young adults to the mysterious ways of God whose work through the Holy Spirit urges and encourages them to find ways to see God at work, to appreciate a sense of the holy, to identify how God actually loves and works through the church, to learn the rudiments of spiritual formation, and to understand and try various spiritual disciplines. Chapter 1: Unpacking the Mystery in Mystery - Examines mystery and types of spirituality. Chapter 2: God's Mysterious Presence - explores God's presence in the mysteries of pain, death, and the end of time. Chapter 3: The Holy Spirit - explores the idea and reality of God's Spirit Chapter 4: Spiritual Formation - explores spiritual formation as a basis of one's relationship with God Chapter 5: What are Spiritual Disciplines? - examines several practices that help us connect with God. Chapter 6: How Am I Supposed to Worship? - Examines the meaning of worship as a way to praise God and to receive from God. Chapter 7: Put It All Together - Reexamines the link between spiritual growth and God's love. This study is part of the 20/30: Bible Study for Young Adults series.