79 It is already possible to identify the areas in need of fuller study before a true consensus of faith can be achieved: 1) the relationship between Sacred Scripture, as the highest authority in matters of faith, and Sacred Tradition, as indispensable to the interpretation of the Word of God; 2) the Eucharist, as the Sacrament of the Body and Blood of Christ, an offering of praise to the Father, the sacrificial memorial and Real Presence of Christ and the sanctifying outpouring of the Holy Spirit; 3) Ordination, as a Sacrament, to the threefold ministry of the episcopate, presbyterate and diaconate; 4) the Magisterium of the Church, entrusted to the Pope and the Bishops in communion with him, understood as a responsibility and an authority exercised in the name of Christ for teaching and safeguarding the faith; 5) the Virgin Mary, as Mother of God and Icon of the Church, the spiritual Mother who intercedes for Christ's disciples and for all humanity. In this courageous journey towards unity, the transparency and the prudence of faith require us to avoid both false irenicism and indifference to the Church's ordinances. Conversely, that same transparency and prudence urge us to reject a halfhearted commitment to unity and, even more, a prejudicial opposition or a defeatism which tends to see everything in negative terms. To uphold a vision of unity which takes account of all the demands of revealed truth does not mean to put a brake on the ecumenical movement. On the contrary, it means preventing it from settling for apparent solutions which would lead to no firm and solid results. The obligation to respect the truth is absolute. Is this not the law of the Gospel?
Source: Ut Unum Sint (Vatican.va)