There is no question more important in a believer's life than this: Who is the God we worship? Everything in the Christian journey-our prayers, our trust, our obedience, our salvation-rests upon knowing the One to whom we belong. To know Him is eternal life; to love Him is our first commandment; and to walk with Him is the source of our peace and strength. Yet many faithful Christians hesitate when they seek to understand how the one God is revealed as Father, Son, and Holy Spirit. Some fear the subject is too deep, while others approach it with uncertainty. But this mystery is not given to confuse us. It is given so that we may draw closer to the living God and worship Him with understanding and joy. This book is written to guide that journey with clarity, reverence, and simplicity. From the beginning of Scripture, we hear the unwavering proclamation: Yahweh is one-the living God who creates, speaks, redeems, and sanctifies. In the New Testament, this same God reveals His love in a fuller and more intimate way. The eternal Word becomes flesh, and the Holy Spirit is poured into our hearts. These are not new gods, nor competing powers, but the one God drawing near to humanity in the richness of His own divine life. The early Fathers contemplated this revelation with wonder. They spoke of God's oneness not as a mathematical puzzle but as a living communion of love: the Father as the Fountain of divine life, the Word as His eternal self-expression, and the Spirit as His life-giving presence. Their language-rooted in Scripture and prayer-helps us see the beauty and coherence of the mystery that the Bible proclaims so clearly. I hope that as you read, you will discover that studying the oneness and self-revelation of God is not an intellectual exercise but a path to deeper faith. Understanding who God is strengthens your worship, steadies your trust, and fills your heart with reverence and peace. "The Oneness and Trinity" is not merely a doctrine to affirm-it is a reality to embrace. May these pages lead you gently into that holy mystery and into a richer communion with the God who reveals Himself to all who seek Him with sincerity and love. Hegumen Abraam Sleman Jersey City, New Jersey November 20th, 2025