Ok, backtracking a little here (if you like quotes), this was the first quote I read recently that ultimately lead to the others. I wasn't thinking about it in relationship to Children's Ministry but maybe you'll be inspired:
"Always listen to experts. They'll tell you what can't be done and why. Then do it."
science fiction author (1907 - 1988)
That's a good definition of an expert. When everyone says it can't be done they tell you why and go do it anyway. I think God is like that.