I would advise anyone who aspires to a writing career that before developing his talent he would be wise to develop a thick hide.
Contrary to what many of you may imagine, a career in letters is not without its drawbacks - chief among them the unpleasant fact that one is frequently called upon to sit down and write.
Any man who keeps working is not a failure. He may not be a great writer, but if he applies the old-fashioned virtues of hard, constant labor, he'll eventually make some kind of career for himself as writer.
Jeanne Veillette Bowerman wrote this great article about having both faith and hope when it comes to your writing career.