When my family and I go on vacation, we designate a turn-around point.

If you realize you forgot something before the turn-around, you can turn back.
If you realize it later, you proceed to destination, the missing Kindle or whatever notwithstanding.
A fully enlightened person would be someone who is truly sick of turning back.
I love it when people define enlightenment in simple terms:
The Buddhist scholar Robert Thurman calls it a “life vacation.”
When you go on vacation, you decide to be happy no matter what.
Why not live the rest of your life this way?
An “enlightened person” is someone who didn’t turn back this time.
A “fully enlightened person” knows what’s back there, and they’re not going back for it.