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Was it really necessary to publish such a huge book about an author who died sometime around 367? And to construct a text from the mass of manuscripts which, of course, attest to his success, but so long ago? Was it necessary for an international team to spend ten years adding French that is worthy of the Latin texts, introducing, annotating and indexing? Was it necessary to aim for a book that would become a reference? Yes, it was. Thwarting the powerful ideas of Arius, who denied that the Word made flesh could be equal to the father, Hilary was the Western world's greatest artisan of the Trinitarian expression of the faith proclaimed in the New Testament. Yes it was, because today's globalization of religions, blended with a sort of secular incertitude about what God might contribute to humanity, make it essential to provide a rigorous and appealing clarification of the originality of the Trinitarian God. This volume is a plunge into the body-to-body combat of the Trinity. What force in his unrelenting affirmation that the Son is equal to the Father, because - quite simply if one may use that word - a father who produces a son who is less than himself is no father! Moreover, he draws his conclusions from a given foundation: to know the Trinitarian divinity with the intellectual and religious tenacity of Hilary is, in the third millennium after Jesus Christ, still an exalting adventure of the mind, through which Man is elevated.