Revelation 3:8

I know thy works (behold, I have set before thee a door opened, which none can shut), that thou hast a little power, and didst keep my word, and didst not deny my name.

A door opened ... Many see here a promise of opportunity; but, in the light of the preceding verse, it appears that the door of admission into the church, the messianic kingdom identified with the church, - this is the door meant. "It assures the church of how futile were such excommunications as the Jews were leveling against them."[40] Beckwith and Mounce concur in this interpretation. However, both of these with many current scholars, hold there is a difference between the church and the kingdom; but throughout this series of commentaries, the position has been maintained that the church and the kingdom are one institution, not two, and that the "everlasting kingdom" mentioned by Peter (2 Peter 1:11) is not a different kingdom, but the eternal phase of the present kingdom. There are many New Testament references regarding the "open door" of opportunity (1 Corinthians 16:9; 2 Corinthians 2:12; Colossians 4:3; Acts 14:27, etc.); but, with reference to all such doors, it is not necessarily true of them that "no man can shut." That promise pertains to the door of God's holy church.

Hast a little power ... The general weakness of the church at Philadelphia is stated here. Despite this, the congregations here and at Smyrna are the only two against which the Lord uttered no condemnation. A church does not have to be large to be true and to be approved by the Lord.

Didst keep my word ... didst not deny my name ... This means simply that the church there had been faithful to their trust; but by contrast with other congregations mentioned in these letters, it could indicate that the principal sins of those not approved were those of not keeping the Lord's word, and of denying his name. For further comments on "the name of the Lord," see under Revelation 2:3.