Christ Opening a Door

The message to the church in Philadelphia shows us that the Lord Jesus had determined to reward his faithful church with an open door of success for preaching the gospel. This afternoon I want to open up this truth so that we will appreciate it and so that we will live in such a way that the Lord will know that we are seeking the same blessing in our own church here. What does it mean when the Lord Jesus says that He will open a door for the church of Philadelphia, a door that no man can shut? I think that we can find 2 answers to that question.