Our external life is an outcome our Aura (Personal Energy Field). For e.g. lack of energies of achievement (golden energies) in our Aura, will create a less satisfying career. While one aspect of the spiritual science it abstract, the other aspect directly affects our lives every moment. 

Even for "practical" or "realistic" people, it is important to realize that eventually life as one sees is a projection of one's own mind brought into effect by one's own energy field.