Speaking of envy, I heard a story about someone who always complained about their life. They always compare themselves with other people and always feel dissatisfied with how their life is going. Objectively though, they're doing fairly well because they got married, have good kids, don't get bothered by loans, etc. They realize it's a problem but find it hard to be content with what they have.
To be fair though, being content with what you have can be quite difficult to distinguish from being passive/lazy. It's easier to judge if your life is decent, though, because you can't say you should accept your life the way it is when you're broke and don't put an effort into looking for a decent job.