Sentence:  I have found , time and again , that some bit of particularly annoying and intractable behavior on the <WSD>part</WSD> of a patient rests , in the final analysis , on this basis ; and only when I can acknowledge this , to myself , as being indeed an aspect of my personality , does it cease to be a prominently troublesome aspect of the patient 's behavior . 
Meaning of the word marked with <WSD> tags:  that which concerns a person with regard to a particular role or situation