One of a Kind Is Now None of a Kind | Vanity Fair:
"Winters drew out of quieter resources, which made his comic gift a fragile thing, not something that could be rushed and goaded, and there were be long gaps in his public appearances, periods when he seemed to hibernate into himself. But unlike so many comics who suffered from drink and depression, Winters didn't acquire a bitter edge as a performer, he maintained his wonderment."

He could be wildly uneven, but when he was on, he could make you laugh so hard it was painful. Always an interesting performer.