What keeps you motivated to keep trading when you have a losing streak

I look at trading as business and losses are nothing but business expenses.
It's pretty hard when I'm on a really big losing streak, but at times like this, I take a small break to clear my head and then I take a look at my trading plan. I went through quite some drawdowns and that's why I have some good "trading wisdoms" written in there to get me back on track.