The real question is: Could you live with yourself if you weren't the kind of man who helped a neighbor in need? I couldn't, so if that has a cost.. so be it...
Some day you'll stand and be judged.... The mowing will be a point in your favor, and you and God can have a laugh about the fence...
Plus...doing the right thing just makes you feel good... Thanks for helping your neighbor...
Regards,
Chris