Being stubborn is good. Especially when you believe in something. Being too stubborn, however, is bad.
If you're too proud to accept help or correct your knowledge then you're missing out on a lot of good things life and people around you has to offer.
Be stubborn when needed. Like, when you're doing something crazy but something that you believe in. The world around you will go haywire. They'll question your motives. Laugh at you. That is when you need to be stubborn and keep doing what you're doing.
For other times such as when someone offers you help that might ease your situation, be less stubborn and accept that help.
The same goes with knowledge. Be open to learning something new even if its integrity stands questionable at first. Listen to what others got to say, research and then choose whether to accept that fact or not. Don't be blinded by your existing knowledge about something.
Keeping a safe amount of stubbornness is what you really need. Don't be too stubborn and miss out life.