I don't know who said it, or even if it's true. But it's certainly worth pondering. Would you want to spend eternity with the person you are today?
Perhaps a good place to start is with our thought lives. Are we often preoccupied with thinking that could be characterized as “hatred, contentions, jealousies, outbursts of wrath, selfish ambitions” or any of the other "works of the flesh" listed by the apostle Paul in Galatians 5?
If so, now is the perfect time to repent and trust in Christ, and to let our souls be permeated by the fruits of the Spirit that Paul named in the same chapter: "love, joy, peace, longsuffering, kindness, goodness, faithfulness, gentleness, self-control" (Galatians 5:22).
These sound like traits I could live with not only in the here and now, but also forevermore. How about you?