As executive producer Craig Silverstein explains in the following promo, sometimes this is an abstract concept. Other times, it's a tangible goal, based on a legitimate mistake one regrets from the past.
The latter will come into play on tomorrow night's episode of Nikita, aptly titled "Partners" because it features the return of Kelly, the woman Nikita teamed up with at Division and left behind four years ago. What has become of her? How does Nikita want to right her previous wrong? Get excited for the installment via this inside look at the episode now: