The Search for Christian Unity 9. The ecumenical movement seeks to be a response to the gift of God's grace which calls all Christians to faith in the mystery of the Church according to the design of God who wishes to bring humanity to salvation and unity in Christ through the Holy Spirit. This movement calls them to the hope that the prayer of Jesus "that they all may be one" will be fully realized. 9 It calls them to that charity which is the new commandment of Christ and the gift by which the Holy Spirit unites all believers. The Second Vatican Council clearly asked Catholics to reach out in love to all other Christians with a charity that desires and works actively to overcome in truth whatever divides them from one another. For the Council, Catholics are to act in hope and in prayer to promote Christian unity. They will be prompted and instructed by their faith in the mystery of the Church, and their ecumenical activity will be inspired and guided by a true understanding of the Church as "a sacrament or instrumental sign of intimate union with God, and of unity of the whole human race".