A human life lasts only a few short decades, and regret runs through it from beginning to end.
There are countless regrets in this world: the powerful brought low, the proud denied what they long for; the playboy dying for his loyalty, the schemer dying for his devotion; the thief dying in an act of generosity, the selfish dying in an act of sacrifice.
Regret is woven into life.
A sudden car accident sent a middle-aged man back thirty years. Hardened by three decades of ups and downs in government, he had the patience of someone who had lived out his days alone and the keen insight built from years of experience. Now, every regret could finally be erased.