behold, I stand at the door, and knock: if any man hear my voice, and open the door, I will come in to him, I will sup with him, and he shall afterwards be entertain'd by me.

I know thy works: behold, I have set before thee an open door, and no man can shut it: for tho' few in number, you have kept my word, and have not renounced my name.

At another time I had a vision, when I saw a door was opened in heaven: and the first voice which I heard talking to me, was like the sound of a trumpet; which said, "come up hither, and I will shew thee things which must be hereafter."