5. Together with all Christ's disciples, the Catholic Church bases upon God's plan her ecumenical commitment to gather all Christians into unity. Indeed, "the Church is not a reality closed in on herself. Rather, she is permanently open to missionary and ecumenical endeavour, for she is sent to the world to announce and witness, to make present and spread the mystery of communion which is essential to her, and to gather all people and all things into Christ, so as to be for all an 'inseparable sacrament of unity' ".
74. "Not every one who says to me, 'Lord, Lord', will enter the kingdom of heaven, but he who does the will of my Father who is in heaven" (Mt 7:21). The consistency and honesty of intentions and of statements of principles are verified by their application to real life. The Council Decree on Ecumenism notes that among other Christians "the faith by which they believe in Christ bears fruit in praise and thanksgiving for the benefits received from the hands of God. Joined to it are a lively sense of justice and a true neighbourly charity".
103. I, John Paul, servus servorum Dei, venture to make my own the words of the Apostle Paul, whose martyrdom, together with that of the Apostle Peter, has bequeathed to this See of Rome the splendour of its witness, and I say to you, the faithful of the Catholic Church, and to you, my brothers and sisters of the other Churches and Ecclesial Communities: "Mend your ways, encourage one another, live in harmony, and the God of love and peace will be with you ... The grace of the Lord Jesus Christ and the love of God and the fellowship of the Holy Spirit be with you all" (2 Cor 13:11,13).
[Pope John Paul II, Ut Unum sint]