The mind is a very powerful thing. Infact it probably harnesses the most powerful force known to man as it is the descision maker, the battery to our body and holder of akk ability to feel, think and act. Safe to say this can land us is many sticky situations. 

As a species (and we are all guilty of this) can allow our intrusive thoughts to overcome us and form unkind and inhabitable senarios in our head. Furthermore, if it is not this then it's inconveniences big or small that can set a negative sheet over our day or long periods of time in our lives; this is because our thoughts have a bidirectional link to our emotions and therefore cause us to have a reaction reguarding wFhat has happened. For example we can expereience adrenaline after thoughts of fear and anxiety.