IIRC this is similar to some of the techniques actually used during the last war (forget the name of the book I read years ago), that worked both on the "common soldier" and the "dedicated officer" classes. Respect, drawing parallels, sharing similar experiences, discussing differences in an objective way etc. Took a good grasp of psychology and a lot of flexibility and patience to do it well though.
"Softly, softly catchee monkey" is actually good advice.
"Look forward; yesterday was a lesson, if you did not learn from it you wasted it."