Failure is a balance. It shouldn't be vilified or ignored as it provides a tremendous opportunity for learning and development.  But one shouldn't get comfortable with failure.  One should be motivated to learn, to study and to prepare in order to avoid failure as much as possible but also accept the lessons when the failure does occur so you can avoid it in the future.  Failure should always be forward in its direction and never agreeable in it's habit.

Never let success get to your head; never let failure get to your heart. Anonymous

Failure is good as long as it doesn’t become a habit.  Michael Eisner

99% of failures come from people who have the habit of making excuses.  Anonymous