Essentially, to obtain high quality in your work, you must first emphasize quantity. You must practice, practice, practice! The more you do something, the better you get at it.
I also love the encouragement here to find an accountability partner. This person can be a friend, a colleague, or someone else in another business that you're returning the favor for! I've seen the concept of accountability partners work on so many great levels in both business and art. It's definitely a motivator!
So, without further explanation, enjoy!