Along with those many other wonderful books, you might want to check into "The Bushido way", or just simple various Bushido teachings.. This goes into developing personal strength and self-discipline, so that one easily overcomes their lack of "motivation".. Its primary teachings are based on "code of moral ethics", which connects us right into our learnings at the dojo's.. Humbleness, Honor, Respect, Self-discipline, Loyalty, Perseverence, Dedication, and of course lessons in warriorism. More of a way to balance out body, mind, spirit, at same time as producing an inner desire and drive to achieve anything and develop strength, you have been striving for.. Hope that helps. :asian: