Ok, this isn't directly related to Rumi, but rather to Shams of Tabriz.
Many of us are aware of the phrase "La illa ha lilla la", basically meaning "There is no God but God". ( Which gets a very bad rap due it's fervored chanting by militant Islamic extremists.) I am fascinated by Shams' death cry, "La illa ha illa ana", "There is no God but me".

I know he was being murdered at the moment, but I suspect he might have indulging in some wordplay to inflame them as they ended his life.They were killing him for being "heretical", after all. I think his statement is quite amazing.

I disbelieve he meant to suggest that he was Supreme- on par with God. I think he was aknowledging his own Divinity, his containment within the Divine. Much like the correlation between the Hindu "Om namaha shivaya', meaning "I honor the Divine within you" and "Om namhmo shivaya", "I honor the Divine within me". I believe he was speaking on the knowledge and experience that there is nothing outside of God. That the perceived separation of the Lover from the Beloved might be a misunderstanding; an error of the heart's reckoning.

I think it's likely Shams phrased it the way he did, knowing full well it would be taken the wrong way by those only too eager to think ill of him. Was this his final, wry commentary on their ignorance and fear? Was he intentionally egging them on?

For me, this is a powerful message from Shams. Sly, ironic, darkly humorous, and ultimately a testament to the knowledge that we are not separate from Spirit. We reside within Love, and Love resides within us.
Salam