Brad Meltzer said this quote

There are some people in your life who bring back old memories. And there are others - your first kiss, your first love, your first sex - who, the moment you see them, bring a spark...and something far more potent. They bring back your old life and with that, potential. And possibilities. And the feeling that if you were back in that time, life could be so very different from where you're stuck right now. That's the most tantalizing thing....I want my potential back.