Love this quote "Great paintings don’t happen by accident. First, you must craft a clear, artistic vision through drawing."
The quote is from Chris Oatley's article about Gustav Klimts drawings http://chrisoatley.com/gustav-klimt-drawings/
It is great article i recommend reading it. Chris Oatley's site has many great and insightful articles that are interesting reads. I would highly recommend checking out his site.