What is your biggest ministry regret?

Assuming you haven’t done everything in your ministry perfectly, and assuming you may even have a few regrets, what is the one thing you would like to be able to do over? For me, I wish I would have pursued a ministry degree, or perhaps a theology degree. I also regret not heeding some of the advice and guidance that was offered to me as a young pastor by older saints who knew what I did not know.