„In cases which concern private revelations, it is better to believe than not to believe, for, if you believe, and it is proven true, you will be happy that you have believed, because our Holy Mother asked it. If you believe, and it should be proven false, you will receive all blessings as if it had been true, because you believed it to be true.“
Pope Urban VIII on Private Revelation http://www.medjugorje.org/purban.htm (2001).
Whether or not Urban VIII said this is debated. He did make a public statement about private revelations and their dissemination in the Catholic Church in his Constitution, Sanctissimus Dominus Noster of 1625-03-13.