The Door of Heaven

When we speak of a "door" in a spiritual sense, we are speaking of gaining access to another dimension. A door controls the entrance into the spiritual dimension even as a door controls the entrance into our home. If a door is that important in our natural life, how much more so does it applies to our spiritual home in heaven? We do not think of leaving our natural home without a key to get back in, yet we are given the impression by some that we can gain access anytime we please. But even ...