This article proposes that the Korean Protestant Church, which has lost its dynamism and is declining, needs a theological reformation. Greatly influenced by Puritan theology, Korean Protestantism has deteriorated into a largely individualistic and consumerist faith. Its credibility has collapsed as it pursued power and turned away from the other. This article identifies Evagrius’ negative theology as a promising theological corrective for the Korean Protestant church. Evagrius’ mystical theology remains largely unknown but his ethical and devotional moral vision provides a viable model for the Korean Protestant Church, which stands at a crossroad today.