Having the ability to be ...

Having the ability to be brutally honest with yourself is the greatest challenge you face when creating a business model. Too often we oversell ourselves on the quality of the idea, service, or product. We don't provide an honest assessment of how we fit in the market, why customers will buy from us, and at what price.
 Mark Cuban

Quotes from the same author

Because if you're prepared and you know what it takes, it's not a risk. You just have to figure out how to get there. There is always a way to get there.
 Mark Cuban
Today is the youngest you will ever be. Live like it.
 Mark Cuban
I'm always afraid of failing. It's great motivation to work harder.
 Mark Cuban
Doesn't matter if the glass is half-empty or half-full. All that matters is that you are the one pouring the water.
 Mark Cuban
I daydreamed for motivation. I didn't lie to myself and talk about my passions and how if I was passionate enough about something I could be successful at it.
 Mark Cuban