Against Celsus Book 4 by Origen of Alexandria is a challenging but insightful read. Origen systematically refutes the arguments put forth by the Roman philosopher Celsus, who criticized Christianity and its followers. This book provides a detailed and erudite defense of the Christian faith, addressing theological and philosophical issues with depth and clarity.

Origen's writing is dense and scholarly, making this book suitable for those with a strong interest in theological matters. However, his arguments are well-reasoned and thought-provoking, offering valuable insights into the early Christian perspective on issues such as the nature of God, the limitations of human understanding, and the importance of faith.

While some readers may find the language and content challenging, those who persevere will be rewarded with a deeper understanding of the intellectual debates that shaped early Christian thought. Overall, Against Celsus Book 4 is a valuable resource for those interested in studying the history of Christianity and the ways in which early believers defended their faith against criticism and opposition.

Book Description:
Against Celsus, preserved entirely in Greek, is a major apologetics work by the Church Father Origen of Alexandria, written in around 248 AD, countering the writings of Celsus, a pagan philosopher and controversialist who had written a scathing attack on Christianity in his treatise "The True Word". Among a variety of other charges, Celsus had denounced many Christian doctrines as irrational and criticized Christians themselves as uneducated, deluded, unpatriotic, close-minded towards reason, and too accepting of sinners. He had accused Jesus of performing his miracles using black magic rather than actual divine powers and of plagiarizing his teachings from Plato. Celsus had warned that Christianity itself was drawing people away from traditional religion and claimed that its growth would lead to a collapse of traditional, conservative values. - Summary by Wikipedia