Keys lock and unlock things. That’s their purpose.
In Revelation 1:17-18 Christ says,
Fear not; I am the First and the Last: I am He Who lives, and was dead; and, behold, I am alive for evermore, Amen; and have the keys of hell and of death.
Think of it: God sent His Son “to be the Savior of the world” (I John 4:14); and now Christ has possession of the keys of death and hell. What do you think the “Savior of the world” (John 4:42), the One Who came to set captives free (Luke 4:18), is going to do with “the keys of hell and of death”? Lock, or unlock them?
Are you afraid of death or hell? Well, you needn’t be. Now that Christ has the keys to both of them, it’s of little wonder that He prefaced His powerful declaration with, “Fear not!”
From Daily Email Goodies by Clyde Pilkington, Jr.