intentions

Taking images of people holding an intention has been a privilege, often a humbling one and requires skilful holding and caretaking - something I am learning more about as I go on. There is the delicate art of when and how I intervene and how I steer the shoot. It isn't only about what I want to see; it's about what wants to be seen.
The human brain is an extraordinary piece of equipment. How is it then that, as a species, we struggle in one very important respect? Why do we find it so hard to change our habits and follow through with our good intentions?