Stanley H. Koster’s New Book Examines What ‘Loving God Completely’ Actually Requires

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Stanley H. Koster has released a new book, "A Whole Heart for God," a 186-page examination of the biblical commandment to love God fully and to love one’s neighbor as oneself. The book was published August 9, 2026, through Christian Faith Publishing and is available in paperback and digital editions.

Koster opens the book, according to the publisher’s description, by treating the human heart as both a biological organ and a spiritual center, a dual lens he says reflects how central it is to a person’s emotional, intellectual, and moral life. He then uses that framework to work through what wholehearted devotion to God looks like in practice, and how that devotion is meant to shape how people treat one another.

The announcement describes Koster as someone with a background in advanced biology and a long-standing habit of Bible study, interests he says have come together over decades of travel and photography focused on the natural world. That combination, of a scientific eye and a devotional one, is what the publisher positions as the book’s throughline: the heart’s physical function as a window into its spiritual significance.

"Writing this book has been a journey of deepening my own understanding of what it means to offer God a whole heart," Koster said in the announcement. "My hope is that readers will find themselves challenged, encouraged, and equipped to love God more fully and to extend that love genuinely to those around them."

The book works through biblical principles on love as, in Koster’s framing, both the greatest commandment and a measure of genuine faith, touching on worship, service, and relationships along the way. It’s available at major retailers including Amazon, Barnes & Noble, Google Play, and the Apple iTunes Store, as well as through the publisher’s website.

Studio CarryOnHarry covers a steady stream of faith-based releases like this one, and what stands out here is the biology-meets-Scripture framing Koster brings to a subject that’s been written about often; whether that angle gives the book real staying power in a crowded devotional market is something readers will have to judge for themselves.

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