" Boundaries are obviously an idea closely related to containers. Boundaries should be flexible, letting in what you want and keeping out what you don’t want. You want to avoid shutting everyone out all the time indiscriminately. And you want to control any urges to merge with others. It would be nice, but it just doesn’t work for long. You lose all of your autonomy. Many HSPs tell me that a major problem for them is poor boundaries—getting involved in situations that are not really their business or their problem, letting too many people distress them, saying more than they wanted, getting mired in other people’s messes, becoming too intimate too fast or with the wrong people. There’s one essential rule here: Boundaries take practice! Make good boundaries your goal. "
― Elaine N. Aron , The Highly Sensitive Person: How to Thrive When the World Overwhelms You