Kingdom of Heaven?

The kingdom of Heaven is referred to many times in the Bible but it has occured to me lately that many disagree about what that is exactly. Then I realized that I hadn't given much thought to what is meant by the kingdom of Heaven. What did Jesus mean when He said the kingdom of Heaven is near or is at hand? Certain scriptures make it impossible to restrict it's meaning to just Heaven itself. So what does it refer to? Sense this is my blog here's my two cents. It seems to me that the kingdom of Heaven, or the kingdom of God, refers to the spiritual domain which is ruled by God and is open to all. Those who put their faith in Father, Son, and Holy Spirit are citizens of that kingdom. It is not something we have to wait for but something that is available now. When I think of it this way I get a sort of "Chronicles of Narnia" feel about my life. I am a citizen in a kingdom that is ruled by an all mighty God. I am more than flesh and bones. It brings to the forefront the idea that I am already part of a spiritual world. The kingdom of God does not seem to be a physical place as we think of kingdoms. And for that reason, it is not limit by borders or walls. It reaches over the entire earth and beyond.