John 1:23 He said, I am the voice of one crying in the wilderness, Make straight the way of the Lord, as said the prophet". 

Rev 3:20 Behold, I stand at the door and knock. If anyone hears my voice and opens the door, I will come in to him and eat with him, and he with me."

Isaiah 22:22 ..What he opens no one can shut, and what he shuts no one can open.