Tim Castle, Author and Negotiation Expert

The biggest mistake salespeople make is they listen to their thoughts and don't take action in spite of them. In a nutshell they allow the external world to control their thoughts about whats possible, they restrict and limit their own potential and they put a cap on what is possible because they give too much attention and energy to their self limiting beliefs. The second thing is they don't have a repeatable scalable process to create momentum and keep a healthy flow of leads coming into their pipeline.