From what I think, perfection cannot be achieved, not fixated. Once you have perfected one thing (actually, a process), another thing springs out of perfection, for it cannot meet the formerly same circumstances but faces different ones. 

If I have no idea, fine. Maybe that's better than having too many :)

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edit: But consider this: It might be the case right now and here. Where is the difference? For obviously people change between happiness and unhappiness anyways.