"Money doesn't solve all of your problems, but it does solve the problem of not having enough money." -
Me
If someone is following their passions, is considered "poor" by someone else's standards, but feels like they are rich, then they are successful.
If someone is following their passions, but complains about not having enough money, then they are not successful.
If someone has plenty but doesn't realize it, then they are also not successful.
Just some simple guidelines that I live by.