Visions are vouchsafed only to those who to prayer have added fasting.
At rare intervals a vision might perhaps be vouchsafed to some Montanistic old woman, or a brother might now and then have a dream that seemed to be of supernatural origin; but the overmastering power of religious enthusiasm was a thing of which the Montanists knew as little as the Catholics.
To these things used to y listen at the time, through the mercy of God vouchsafed to me, noting them down, not on paper but in my heart, and constantly by the grace of God brood over my accurate recollections."These are priceless words, for they establish a chain of tradition (John-Polycarp-Irenaeus) which is without a parallel in early church history.
Their leader Ambrose went so far as to hold further that the revelation which was vouchsafed to him was a higher authority than the Scriptures.