In a world torn apart by division and anxiety, there is greater need than ever for church unity, and for united action to help transform the world and its ways. "Called to the One Hope" challenges the churches to provide a common response to the insecurities and dangers that plague humanity in the opening decade of the 21st century. Samuel Kobia, general secretary of the World Council of Churches, has travelled widely and heard the cries of people affected by hatred, violence, starvation, economic injustice and environmental degradation. At other moments, he has heard enthusiastic expressions of joy and hope. He has encountered the spiritual yearning of youth who are seeking a more profound relationship with God. In this book, Kobia addresses humanitys sense of alienation and quest for identity, asking how the churches, the ecumenical movement and the World Council of Churches -- divided as they are -- may yet be renewed for service. Reiterating the radical message of Jesus, he calls for a spirituality of resistance to all that threaten people and the planet. Kobia recognises signs of hope already manifesting themselves throughout the world, and reports experiences of grace and transformation that may serve as models for future Christian witness and common action.