"Church in Philadelphia" (2) - Christ the door opener

Part 21 of the Revelation series:

The church in Philadelphia is a church that had little strength and Christ opened a door for them. Whether the door was to enter the Kingdom or for them to perform ministry, Jesus was the One who opened the door.

We also notice how God takes persecutors of the church and causes them to come and worship with believers. Only God can do that.

Who belongs to the synagogue of Satan?

What does this letter to the church in Philadelphia say to us today?