It is hard to understand what “The Kingdom of Heaven is within you” really means. This is because it is not understandable to the ego, which interprets it as if something outside is inside, and this does not mean anything.
The word “within” is unnecessary. The Kingdom of Heaven is you.
What else but you did the Creator create and what else but you is His Kingdom?
J, A Course in Miracles
To struggle against your nature is what you have spent a lifetime doing. Stop. If you allow your potential to be released, your true nature in all its wholeness will be revealed.
~ Christ, A Course of Love