What to do when the heart is closed

Lately Baptist de Pape, Han Koorneefe, Lilou Mace and others have been corresponding with me about this particular topic.  It's been fascinating!  The same questions sometimes come back to us, though. Here's one: If one of our life-tasks is to try and keep an open heart (and I have every reason to believe this is the case.  If you disagree then I'd respectfully refer you to 'The Six Archetypes of Love'.  It may change your mind.) then how do we deal with those whose hearts have become closed?

Som