Calculating Grace
Learning Love Across the Social Divide
I sat in my Honda minivan in a country music parking lot, completely out of place, waiting for the phone call I knew would shatter a decade-long delusion. How did a biology professor end up here — and what did twenty-three years of cross-class friendship teach me about the love I claimed to believe in?
by Joel Duff
Available: March 16, 2026
About the Book
When a struggling, older student in his biology class looked me in the eye and declared, “You know what this means — we’re brother and sister in Christ,” I had no idea he was entering a relationship that would dismantle everything I thought I knew about Christian service, authentic community, and my own carefully rationed compassion. Over twenty-three years, that claim of spiritual kinship led me from the safe distance of paid utility bills and screened phone calls into broken furnaces, cockroach-infested kitchens, emergency rooms, and eventually the parking lot of a Jason Aldean concert — where a romance scam years in the making reached its devastating climax.
Calculating Grace is the story of that journey: a professor’s honest, sometimes unflattering account of learning what it costs to love someone whose life looks nothing like his own. Drawing on Augustine, Bonhoeffer, Kierkegaard, and Dostoevsky, I wrestle with the questions that comfortable Christianity prefers to avoid. When does helping become enabling? What do our carefully measured acts of charity reveal about the faith we profess? And what happens when the person you’re trying to save turns out to be the one teaching you about grace?
Part confessional memoir, part theological reflection, this book holds a mirror up to the middle-class suburban church — and to anyone who has ever calculated the cost of compassion before deciding whether to answer the phone.
Table of Contents
Prologue: No Tickets at Will Call
Part One: First Encounters (Learning to Listen)
Chapter 1: The Student in the Front Row
Chapter 2: The Mathematics of Avoidance
Chapter 3: Accidental Truth
Part Two: Entering Their World
Chapter 4: The Furnace and the Pitbull
Chapter 5: Birthday Cake and Country Stars
Chapter 6: Christmas: An Invitation to Church
Part Three: Life Together
Chapter 7: Daily Bread and Dreams Deferred
Chapter 8: The Business of Hope
Chapter 9: Puppies and Promises
Chapter 10: Emergency Room as Sanctuary
Part Four: The Romance Scam (Crisis and Revelation)
Chapter 11: Twelve Years of Jason Aldean
Chapter 12: Counting Down to Blossom
Chapter 13: Truth in Transit
Chapter 14: Two Hundred and Twenty Dollars of Hope
Chapter 15: A Voice from the Margins
Part Five: Aftermath and Understanding
Chapter 16: The Morning After
Chapter 17: The Indispensable Weak in the Church
Chapter 18: Still Calling Me Brother (Epilogue)
Discussion questions follow each chapter
“The mathematics never quite balanced. But in the economy of grace, perhaps it didn’t need to.”
Drawn from Life
These original pencil illustrations, featured in the book, depict the living conditions described in the narrative — the reality behind twenty years of phone calls and paid utility bills.
“Her Living Room” The room where Deb spent most of her waking hours — every surface covered, every corner claimed, a life compressed into the space that remained.
“Where She Slept” The dining room converted to a sleeping space — blankets on the floor, shelves of canned goods, boxes stacked to the ceiling. This was home.
What This Book Explores
These are not problems to be solved but tensions to be inhabited. The questions that emerge when comfortable faith meets inconvenient love.
Helping vs. Enabling
When does generosity become complicity? The agonizing line between supporting someone in need and subsidizing patterns that keep them trapped.
The Church & Radical Hospitality
The gap between what suburban churches say about welcoming the poor and what actually happens when the poor walk through the door and stay.
Romance Scams & Exploitation
How predators target the vulnerable, from payday loans to fake celebrities, and what their success reveals about unmet human needs for love and significance.
Incarnational Theology
God entered our delusions to walk with us toward freedom. What does that divine pattern mean for how we love people whose stories never quite make sense?
The Delusions We All Carry
Their fantasies were obvious; mine were culturally reinforced. The book turns the mirror on the reader’s own socially acceptable versions of the same human need.
Ideal for book clubs and small groups. Each chapter includes reflection questions designed to move the conversation from the page to the pew — and beyond.
About the Author
Joel Duff
Joel Duff is a professor of biology at the University of Akron, where he has taught for over two decades. A science communicator with a popular YouTube channel and long-running blog, he writes at the intersection of faith, science, and culture.
Joel grew up as a preacher’s kid in small Presbyterian churches where his father regularly navigated the complexities of serving people in crisis — experiences that shaped his understanding of both the church’s potential and its limitations. He holds a Ph.D. in botany and writes from within the Reformed theological tradition, drawing on thinkers from Calvin and Kuyper to Bonhoeffer and Wolterstorff.
Calculating Grace is his first book of narrative nonfiction. He lives in Ohio with his family.
Get Your Copy
Available in paperback wherever books are sold March 16th.
Paperback, 260 pages | 6 × 9 inches | ISBN: 979-8-9951621-0-0 | Price: $18.99
Publisher: Two Books Publishing
© 2025 Joel Duff · joelduff.org
Dr. Joel Duff 