I love this metaphor, and also acknowledge that few of us ever attain this level of radical acceptance.
Still, it is useful to strive for.
The more we deny, shun, avoid, or suppress our thoughts and emotions, the less we know ourselves.
There are many things to be learned about ourselves and the way we have been taught to see the world by learning to observe our thoughts and feelings.
And I would argue Rumi’s last point, that he says our thoughts and feelings are guides from beyond. I believe they are guides from within. It is our job to listen and learn from them. The more we do so, the more we can know ourselves.