I'm not talking about if you are flexible and can do back flips and bend backs or any other sort of acrobatic trick, I'm talking about being flexible in your thinking and the way you approach things.
As an author you have to be flexible. You have to be able to listen to critiques and maybe delete that scene you love. When you get edits from your editor you have to put aside the 'but it's my story' mentality and make the changes that will ultimately make your book better.
The same is said for how you want to be published. When I first got into writing 10 years ago, when someone sold to an 'e-publisher' people congratulated them but secretly were thinking, e-publishers won't last, print is more stable.
Fast forward 10 years and as we all know the role is reversed. I've sold to an e-publisher and have a request from another e-publisher, but I'm also still pursuing the print route.
Today there are so many more options for us as authors and individuals that we have to let got of our preconceived snobbery and embrace the 'new world'. After all isn't our goal to get our work published?