Just because you say, write, or do something doesn’t mean that others understand it in the same way that you do (called your authorial intent). “Understanding” means that two or more people’s worldviews (your worldview is all of your views about how yourself and the world/universe are organized and work), mental models (a mental model is how you imagine something in your mind), and intuitive feelings about something match, which often requires considerable back-and-forth communication or study about both people’s ideas, societies, cultures, past experiences, feelings, beliefs, etc. This process of negotiating a common understanding with a person, book, etc. using a back-and-forth process is called the hermeneutic circle.
Whenever you read or hear something important, try to learn about the author and understand their perspective. If you read things only from your own perspective, you will often misunderstand others.