That applies to people, although many don't seem to realize it, stuck as they are in the wrong job, the wrong marriage, or the wrong house. When you know and respect your Inner Nature, you know where you belong. You also know where you don't belong. It is good to obey all the rules when you're young, so you'll have the strength to break them when you're old. There was a thoughtful pause in the conversation as the assembled Brethren mentally divided the universe into the deserving and the undeserving, and put themselves on the appropriate side.
Life is full of concepts that are poorly defined.
In fact, there are very few concepts that aren't. It's hard to think of any in non-technical fields. Prediction is very difficult, especially of the future. Sex is like air. It's only a big deal if you can't get any.