"Everyone feels benevolent if nothing happens to be annoying him at the moment." The Problem of Pain by C.S. Lewis.
I would also add that I feel benevolent when I'm not depressed or lonely. With Tracy and Fischer gone, I've not felt very benevolent lately. When they are gone, it's almost like a piece of my goodness goes with them. I can truly say they bring out the best in me.
Oh, to be more like Christ, pouring myself out for others even when I don't want to.
Even when I'm lonely.
Even when I'm annoyed.