Sense of an ending

In my writing group we have a running joke that no matter what or whose piece I'm critiquing, my advice will always be to cut the last paragraph. I could have sworn it was something Hemingway said but now I can't seem to find the reference. So let's leave it at this: a wise writer once said we should all cut our last paragraphs.

There is a tendency, often, to wax on for too long. Or, worse, to be anxious that the reader will not get it, will fail to properly understand the story. And then the writer, in a moment of weakness, crams a horrible summary at the end to explain the whole thing. No. Just erase all that stuff. The real ending is three sentences up.