Thought Awareness
You are thinking negatively when you fear the future, put yourself down, criticize yourself for errors, doubt your abilities, or expect failure. Negative thinking damages confidence, harms performance and paralyzes mental skills.

A major problem with this is that negative thoughts tend to flit into our consciousness, do their damage and flit back out again with their significance, having barely been noticed. Since we do not challenge them, they can be completely incorrect and wrong.