The ancient philosopher Diogenes The Cynic used to say that every man is within a fingers breadth of going insane.It took me a lot of thought, but I think I now understand this statement.
Every person experiences challenges in their life to the extent that they are capable of advancing through them. A person who solves their financial problems will be left with problems of how to invest. An addict will struggle with that issue because it grows to the extant of their ability to control it.
Its the Peter Principle but in the form of all of our lives.