Hardest personal lesson learned?

[RoboMom]

Originally Posted by Tyler_Kaplan

To never take anything personally. The team didn't go with your design/idea/strategy/whatever? That's totally fine. I think learning to not take anything personally in a business and professional setting is a valuable lesson. It's not because the team is against you, and in fact you should embrace the fact that you're surrounded by people who are intelligent in that field, and can come up with amazing ideas.
This is something I learned when I was a student on 2085, and is one of my favorite life lessons.

This is very wise insight and is one of the tenets of a little book called "The Four Agreements." Personally I have to re-learn this all the time. It is hard.