The Power of a Preposition

Just came across this article in the always stimulating Leadership journal. It's particularly talking about children's ministry, but, it seems to me, the basic point could equally apply to youth work, and to adult ministry in church. The big question: are we ministering to, for or with? And my slightly tentative follow-up: are there circumstances when each one of these would be appropriate, in which case the trick would surely be to know what is right in each situation?