Article at the Times Online today about private revelations. I know B16 isn't as receptive to the revelations as JPII seemingly was, but I'm not sure if the harsh picture painted by the article is entirely accurate.
Regardless of the accuracy of the B16 picture (click on the first link above to read it), this statement toward the beginning of the article is accurate:
[S]uch “private revelations” have proliferated. Around the Millennium there was an explosion in claims of heavenly visions, messages, stigmata and Eucharistic miracles. But of the 295 such episodes reported since 1905, the Vatican has affirmed the authenticity of just 11, among them the appearances of the Virgin Mary to three children at Fátima, Portugal, in 1917, and the visitation of Jesus to St Faustina Kowalska, a Polish nun, in the 1930s.
While the faithful may accept or reject such revelations, most, according to the Vatican, involve false seers who are either deluded or on the make, and these are beginning to cause problems for the Church.
First, they create tensions between the faithful who believe in them and bishops who do not. Secondly, unauthorised cults often congregate around charismatic seers who claim a direct line to God but who teach in opposition to the Church.
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I found this on a blog search, which is supposedly B16's views on private revelation:
The authority of private revelations is essentially different from that of the definitive public Revelation. The latter demands faith; in it in fact God himself speaks to us through human words and the mediation of the living community of the Church. Faith in God and in his word is different from any other human faith, trust or opinion. The certainty that it is God who is speaking gives me the assurance that I am in touch with truth itself. It gives me a certitude which is beyond verification by any human way of knowing. It is the certitude upon which I build my life and to which I entrust myself in dying. Private revelation is a help to this faith, and shows its credibility precisely by leading me back to the definitive public Revelation.
The criterion for the truth and value of a private revelation is therefore its orientation to Christ himself. When it leads us away from him, when it becomes independent of him or even presents itself as another and better plan of salvation, more important than the Gospel, then it certainly does not come from the Holy Spirit, who guides us more deeply into the Gospel and not away from it. This does not mean that a private revelation will not offer new emphases or give rise to new devotional forms, or deepen and spread older forms. But in all of this there must be a nurturing of faith, hope and love, which are the unchanging path to salvation for everyone.