"Gone for good"

     It must be the water I've been drinking, but word usage and phrases are suddenly catching my attention. And then they rattle around in the vast emptiness of my cranium until I can't stand it. Almost worse than getting a song stuck in you head ("Its A Small World").
     To whit: "Then it'll be gone for good."
     What does that mean? Is the fact that whatever "it" maybe, it is good that its gone? But if you use the phrase to say when some one died "he's gone for good," do you mean it is good that he's gone? Or that he went to a good place, assuming you have some knowledge of his ultimate reality.
     These things hurt to think about.