To me, as much as technique will make a rider, or not, so will attitude. The absolute pinnacle of this idea is Para Dressage. 2016 was an Olympic year, and I searched out some performances:
Here's a sincere look behind the scenes of British Para Dressage:
In trying to foster these ideals in students, I must first lead by example.
If you're a real reader, here are some thoughts and references from top coach William Micklem on the idea of 'both effort and delight' in equestrian sport:
http://eventingnation.com/william-micklem-on-the-subject-of-happiness/
http://eventingnation.com/william-micklem-more-thoughts-on-the-subject-of-happiness/