While not common, many priests and religious will tell you that there are times during spiritual situations where they open their mouth and certain words just pour out of them of their own accord. No, it was not infallibility, but it is not unheard of for the Holy Spirit to inspire small prophecies in every-day servants of God. It has happened to me a couple of times and you just sit back, thinking, "What the heck did I just say?!’ The times when the Holy Spirit speaks of the future are only the most blatant examples. The same thing sometimes happens when you are simply compelled, for an unknown reason, to give some piece of advice which turns out to be exactly what the other person needs to hear. This is a rather regular occurrence for priests and religious, but is no less of an outpouring of the Holy Spirit as prophecies of the future.