A lucid exposition of Eastern Orthodox mystical theology that argues true theology is lived, liturgical, and contemplative participation in God rather than mere intellectual abstraction; it emphasizes apophatic (negative) theology, the distinction between God’s unknowable essence and His knowable energies, and the transformative goal of theosis (deification). Drawing on the Church Fathers and sacramental and liturgical practice, the work shows how prayer, icons, and the sacraments enable an experiential knowledge of God beyond concepts, presenting theology as an encounter with the living God within the Tradition of the Eastern Church.