The complex nature of Christian communion with a personal God requires a nuanced expression. Since its inception, the early church affirmed God's unknowable nature and also participation in God through Christ. The church fathers employed the language of theosis in talking about union with God and human transformation in the likeness of God. However, the term theosis or deification is a broad category and requires precise explanation to avoid human dissolution in the divine in the mystical union. This book addresses the conundrum of imparticipable divine nature and personal union between human and the Trinity. If God is Trinity, then we are created and restored in the image of tripersonal God.