Phrase encouraging a listener to set aside their opinion on a particular subject and attempt to look at that same situation through the eyes of another in an attempt to understand that person's perspective and/or opinion.
After listening to Betsy's bullshit take on how horrible IV drug users are Kevin replied back, "Whatever, bitch, if you could hit yourself on your own you'd be just like them. How about you step outside yourself before you go talking shit about people who are just doing something that you wish you could do, you fucking hater".
The first rule from the book the 48 laws of power. It means to never ever show the full extent of your talents if it looks like it will pass your superior's.
Explanation: Superiors whether its teachers or bosses are just like any other people. They have insecurities and egos. Once you expose them they will do their best to bring you down to show they are at the top.
Jane was confused why she was fired even though she was the most talented worker in the company. She didn't realize she made her boss insecure and should Never Outshine The Master.