The eminent psychiatrist Colin Murray Parkes illuminates the importance of secure attachments for human happiness and sees insecurity at the root of conflict and extremism.

Accepting advice from wise outsiders is crucial, he argues, whether healing the emotional wounds of bereavement or breaking the cycle of political violence.

"Out of this support new national and personal identities are emerging with subtle changes in the feelings that go with them," he says.

Producer: Sheila Cook.