This book is a plea to embrace serious thinking as a means of loving God and people. It is a plea to reject either-or thinking when it comes to head and heart, thinking and feeling, reason and faith, theology and doxology, mental labor and the ministry of love. It is a plea to see thinking as a necessary, God-ordained means of knowing God. Thinking is one of the important ways that we put the fuel of knowledge on the fires of worship and service to the world.