I agree that worldview, mindsets, and the subconscious have an impressive influence over motivation. James Clear wrote a blog post about another perspective on the matter here: http://jamesclear.com/stay-focused
In this post, he suggests that whoever can handle reputation and  boredom will stay on path, while others will not. The introduction of boredom ties in a new element that many people don't touch on.
Thank you for your kind reply, Julian