One ditch is a perfectionist attitude.
Do you keep writing the same piece over and over, trying to get it absolutely perfect before letting anyone else lay eyes on it? Are you so worried about creating the best possible prose that you find it hard to put together a finished piece? If so, then you, my friend, are a perfectionist. Newsflash: there are no perfect writers. Nope. Not one.
"Perfectionism is a dream killer.
Because it's just fear disguised as trying to do your best.
It just is."
The other ditch is an unteachable spirit.
This is the ditch on the opposite side of the road from perfectionism. Someone who's writing is stuck in a deep rut simply because he won't listen to advice from seasoned writers on how to improve his craft. Your writing will never advance if you don't work hard to make it grow.
"The moment you become unteachable
is the moment you can unpack your things --
you'll be wherever you are for awhile."