Several enlightenments are liberating in life, here are a few:
(1) Gaining a new perspective on something; whether a friend finally beat that message into you, figuratively speaking, or you figured it out on your own;
(2) Learning that saying "no" is an option. This one is particularly enlightening if you are of Asia ancestry and were raised to be passive-aggressive. We were conditioned to say yes, albeit our disgruntlement, so learning that sometimes you can just say "no" is very liberating.
"Can you ...... ?"
"Would you like to ..... ?"
(3) Last but not the least (I'm sure I'll have lots more to add to this list in the future), learning to distinguish your problem versus others' problems and to not worry about others' problems.
Your problem being defined at those that will have an (negative) impact on your life if you don't take care of it. Others' problems are, well, others' problems. And sometimes it's just nice that... it's not your problem. And try not to make it yours. :)