Billy Graham was just interviewed. Here is what he said to the question,

If you could, would you go back and do anything differently?

Yes, of course. I'd spend more time at home with my family, and I'd study more and preach less. I wouldn't have taken so many speaking engagements, including some of the things I did over the years that I probably didn't really need to do—weddings and funerals and building dedications, things like that. Whenever I counsel someone who feels called to be an evangelist, I always urge them to guard their time and not feel like they have to do everything.

I also would have steered clear of politics. I'm grateful for the opportunities God gave me to minister to people in high places; people in power have spiritual and personal needs like everyone else, and often they have no one to talk to. But looking back I know I sometimes crossed the line, and I wouldn't do that now.

It seems to me these are wise words for pastors. “No soldier gets entangled in civilian pursuits, since his aim is to please the one who enlisted him.” (2 Timothy 2:4). And there are even “military” acts one can do too many of. Focus on the main things and work with all your might.