The recent rediscovery of the doctrine of the Trinity has left great impact on the thought and life of the Christian Church. With this reinstatement, the Trinity, which was left out for long as an esoteric mystery, has captured the imagination of theologians and elicited remarkable trinitarian formulations from across theological traditions. This contemporary development has forced the church to review its dogma, spirituality, and Christian practices through the lens of this central doctrine of the Christian faith. One of the important and essential upshots of the doctrine has been the reclamation of a theocentric and trinitarian understanding of mission as the missio Dei. In view of the modern renewal of the Trinity and the global expansion of Christianity, this book explores insights and perspectives from the trinitarian thoughts of St. Augustine and the Indian theologian Brahmabandhab Upadhyay that can inform missio Dei theology relevant for the Indian context.