Your not sharing it in a way that's understandable?
People learn and think about things in different ways. An explanation for something that's clear to you might be gibberish to me. Continuing to explain it to me in a way you understand doesn't really help me.
In my experience, people develop a better understanding of a particular concept if they take the time to figure it out for themselves rather than relying on someone to explain it to them.
The person might not be able to figure it out on their own. That doesn't mean they're dumb; they just missed a particular intuitive leap that was easier for you.
The person might dive into it and learn it incorrectly. They might find something on the internet that seems to make sense, but isn't a good way of doing it. Then you have to clean up the mess their imperfect understanding caused, plus help them unlearn the wrong thing.
I think the best bit is somewhere in between. When learning something new, everyone should do some of their own research and self-teaching. But having someone knowledgeable to also teach can be essential, and if someone like that is available, I think it's wise for a self-learner to at least check their understanding with that person, early on.