The Gatekeeper to the Subconscious Mind is your Conscious Mind.

Nothing negative can find a foothold in me this day. No doubt or fear can attach itself to me. No accidents or mistakes can occur because I walk in a path of right action, both when I am thinking of it and when I am not. I release myself and all my affairs this day to the perfect working of that Perfect Law, which turns these thoughts into things.  Frederick W(illiam) Bailes

Although we all have one brain, we possess two minds or two phases of mind power - CONSCIOUS and SUBCONSCIOUS.