From personal experience, I can't tell you how many times a priest is disappointed over the years when a person in whom he has invested much time, energy and prayer turns out not to be a faithful parishioner. It doesn't matter if it is a person coming for marriage counseling, a would be convert (BTW, the flame-out rate there is high) or any other reason. You would think he would despair. But, one saved soul, one strong in faith, far outweighs all of those who don't work out. Many times my dad would go out on a limb to work with someone "coming home" to the church only to be disappointed in the end. That never stopped him from treating the next seeker or returnee with his time, love, respect and prayers. THE ONE THING HE HAD ZERO TOLERANCE FOR WERE COFFEE KLATCH FOLKS YACKING ABOUT SUCH THINGS. Bishops feel the same way with vocations and clergy.