Therefore the major question that remains is whether in the light of that depth of agreement the issues that still divide us have the same weight – issues about authority in the Church, about primacy (especially the unique position of the pope), and the relations between the local churches and the universal church in making decisions (about matters like the ordination of women, for instance). Are they theological questions in the same sense as the bigger issues on which there is already clear agreement? And if they are, how exactly is it that they make a difference to our basic understanding of salvation and communion? But if they are not, why do they still stand in the way of fuller visible unity? Can there, for example, be a model of unity as a communion of churches which have different attitudes to how the papal primacy is expressed?This might sound terribly triumphalistic but Williams argues like a Protestant! We Catholics certainly believe in a "heirarchy" of doctrines: the Trinity is probably more significant than distinctions between the particular and general judgement, for example. We accept that we are human and not God, therefore though we are capable of penetrating the Mystery of God by reason and Revelation, we can never know Him fully, presumably not even by Grace.
Catholics believe God has revealed Himself, Revelation is of His nature. For us this Revelation is not merely Propositions drawn from scripture, which seems to be how the Protestant mind works, it is rather the acceptance of something much more pneumatological, an indwelling of the Holy Spirit, the Spirit that leads us into all Truth. Catholics, and those of the ancient Apostolic Churches believe "faith" and the aceceptance of Revelation is a gift which comes from baptism. The ancient pre-baptismal question illustrates this: the Priest asks, "What do you desire?" The catechumen -or God-parents- answers, "Faith". It is Faith in what the Church, the Christian community, through the power of the Holy Spirit has to pass on. In a sense it is aquiesance to the Church's teaching, in fact to communion with God in the Holy Spirit hook, line and sinker.
This is going to be the great problem with our future relations with Anglicanism, we can't any longer pretend we are speaking about unity, or wholeness only acout individual propositions.