Affirmations are a very powerful way of challenging negative thoughts. Your mind learns by repetition so the more you tell it something the greater the chances that it will accept it.
What you believe about yourself will have a significant impact on your behaviour; what you do or choose not to do. This then affects your opportunities for success in your career or business.
Science has caught up now with benefits of self affirmations and we now know there is MRI evidence which suggests that certain neural pathways are increased when people practice self-affirmation tasks (Cascio et al., 2016)
Critcher and Dunning (2015) – article covers how self affirmations can foster a broader sense of self-concept.