There is no need to deny the existence of any negativity, whether in the form of negative thoughts, emotions, bodily sensations or otherwise. There is also no need, for example, to replace negative thoughts with positive thoughts. Just let them be ... and 'resist not.' Understand that, in and of themselves, these 'things' (negative thoughts, emotions and bodily sensations) have no power to hurt you.
Anyway, we gain insight into the cause of our problem. Of course, insight alone is not enough, but without insight there is no possibility of there being any change for the better.
THE MINDFUL ART OF KNOWING ONESELF