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Forever
Hohenheim used to think eternity was something to strive for, something to be desired, to be fought for and horded at all costs. He used to think that he would love Dante forever, that their shared passion for the Great Work that bound them together would do so for eternity.
That was before he had everything he'd ever wanted and realized that it wasn't enough to make him happy. That was before he found again the happiness he'd lost in a brown-haired girl's quiet smile and the laughter of two golden-haired children.
Now, he realizes that he was a fool.