Whilst walking along our local High Street, I noticed a large display of pink marshmallows in the window of our local bakers. 
Years later the study went on to  establish what had happened  to each of the children as  they transitioned into adulthood.  Interestingly there appeared  to be a clear correlation  between those children who  were disciplined enough to  hold on for the second  marshmallow and their ongoing  success as an adult.  Conversely those children who  were tempted to immediately  access the single marshmallow fared less  successfully, often over  reacting to the various  situations they found  themselves in and acting  impulsively.It could be concluded that this experiment highlights two distinct personality traits that people are born with however Goleman reasons that these different behavioural responses can indeed be influenced and developed by an individual. 
As a leader we sometimes encounter poor performing members of the team who suggest the reason for  their shortcomings is down to "just being the way I am".  Perhaps no one has invested  time to firstly challenge this assumption and secondly support the individual to work on their behaviour. For some this can be identifying and working on the limiting beliefs held by the person to help them break out of a cycle that has steadily become ingrained over time. This cycle begins with the limiting belief which then impacts emotions that subsequently influence behaviours which  ultimately affect the outcome. The often negative outcome only serves to reinforce the limiting belief held by the individual and cycle continues.
The key therefore is to really focus in on the belief that is underpinning the behaviour and challenging the reasons why that person holds the belief. Often these reasons start to become no more than excuses when identified and viewed in isolation creating the opportunity to systematically develop a new, more positive belief in place of the limiting one.  
It's amazing how this whole thought process can be triggered off by a single random observation. 
The brain is indeed a wonderful piece of technology!
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