Theme is not the same as morals.
Theme can be described as a unifying concept which you arc through.
Morals imply that you are trying to communicate some message that differentiates right from wrong.
Granted, they are often intertwined, but not necessarily.
Read the 2000+ stage Hero's Journey/Transformation/New World, which you can purchase from http://www.clickok.co.uk/index4.html