Toward unity
Concern for achieving unity "involves the whole Church, faithful and clergy alike." But we must realize "that this holy objective - the reconciliation of all Christians in the unity of the one and only Church of Christ - transcends human powers and gifts." That is why we place all our hope "in the prayer of Christ for the Church, in the love of the Father for us, and in the power of the Holy Spirit."
Source: Catechism of the Catholic Church (Vatican.va)