Big Theology for Little Hearts Each book in the Big Theology for Little Hearts series introduces a big idea from the Bible with concise definitions and engaging illustrations to help young minds gain a foundational understanding of God's word. With each volume written to complement all the others, this series is designed to help children develop a cohesive framework of theology that includes God, creation, humanity, Jesus, and the gospel-allowing you to start having crucial conversations with your children as early as possible.