'Open' in the Bible

"To the minister of the Church at Philadelphia write as follows: "'This is what the holy One and the true says--He who has the key of David--He who opens and no one shall shut, and shuts and no one shall open.

After all this I looked and saw a door in Heaven standing open, and the voice that I had previously heard, which resembled the blast of a trumpet, again spoke to me and said, "Come up here, and I will show you things which are to happen in the future."

And I saw a mighty angel who was exclaiming in a loud voice, "Who is worthy to open the book and break its seals?"

But no one in Heaven, or on earth, or under the earth, was able to open the book or look into it.

And while I was weeping bitterly, because no one was found worthy to open the book or look into it,

one of the Elders said to me, "Do not weep. The Lion which belongs to the tribe of Judah, the Root of David, has triumphed, and will open the book and break its seven seals."

Then the voice which I had heard speaking from Heaven once more addressed me. It said, "Go and take the little book which lies open in the hand of the angel who is standing on the sea and on the land."

Then I saw a door open in Heaven, and a white horse appeared. Its rider was named "Faithful and True" --being One who in righteousness acts as Judge, and makes war.