The idea of this article is not so much that we become what we believe as that we are those beliefs and thoughts, and yet we can also step out of them, at least for the time being, by being aware of them.  Of course, when we are aware of thoughts, we are some other thought in turn, although it is perhaps possible to step out of the realm of thought entirely at least momentarily.  

The researchers anticipated that four aspects of mindfulness would predict higher self-esteem: Labeling internal experiences with words, which might prevent people from getting consumed by self-critical thoughts and emotions; Bringing a non-judgmental attitude toward thoughts and emotions, which could help individuals have a neutral, accepting attitude toward the self; Sustaining attention on the present moment, which could help people avoid becoming caught up in self-critical thoughts that relate to events from the past or future; Letting thoughts and emotions enter and leave awareness without reacting to them.