Revelation 3:8

“I know thy works, etc.] Good works, of faith, love, and patience; and which lay much in preaching, professing, and maintaining the pure Gospel, and in acts of charity to one another; and which were done to some degree of perfection, and with great sincerity; since this church is not complained of, that her works were not perfect before God, as the former church is: behold, I have set before thee an open door, and no man can shut it; or “which no man can shut”, as read the Alexandrian copy, and others, the Complutensian edition, the Vulgate Latin, and all the Oriental versions. This “open door” may design an uncommon opportunity of preaching the Gospel; and a very great freedom of mind in the…”

“I have set--Greek, "given": it is My gracious gift to thee. open door--for evangelization; a door of spiritual usefulness. The opening of a door by Him to the Philadelphian Church accords with the previous assignation to Him of "the key of David." and--The three oldest manuscripts, A, B, C, and ORIGEN read, "which no man can shut." for--"because." a little--This gives the idea that Christ says, He sets before Philadelphia an open door because she has some little strength; whereas the sense rather is, He does so because she has "but little strength": being consciously weak herself, she is the fitter object for God's power to rest on [so AQUINAS], that so the Lord Christ may have all the…”

“I know thy works - See the notes on Revelation 2:2. Behold, I have set before thee an open door - Referring to his authority as stated in Revelation 3:7. The “open door” here evidently refers to the enjoyment of some privilege or honor; and, so far as the language is concerned, it may refer to any one of the following things - either: (1)The ability to do good - represented as the “opening of the door.” Compare Acts 14:27; 1Co 16:9; 2 Corinthians 2:12; Colossians 4:3. (2)The privilege of access to the heavenly palace; that is, that they had an abundant opportunity of securing their salvation, the door being never closed against them by day or by night. Compare Revelation 21:25. Or. (3)It may…”

“I have given before thee an opened door - To enter into the joy of thy Lord; and, meantime, to go on unhindered in every good work. Thou hast a little strength - But little outward human strength; a little, poor, mean, despicable company. Yet thou hast kept my word - Both in judgment and practice. Revelation 3:9”

“3:8 I know: See study note on 2:2-3. • little strength: Like the city of Philadelphia itself (see study note on 3:7), the Christians there were not prosperous, and they lacked status and power. But Christ had opened a door for them (see 3:7) to claim his status and authority. In spite of their weakness, the Philadelphia church obeyed Christ’s word and did not deny him under pressure.”

“I know: Rev 3:1, Rev 3:15, Rev 2:2 an open: Rev 3:7; Co1 16:9; Co2 2:12; Col 4:3 a little: Dan 11:34; Co2 12:8-10; Phi 4:13 and hast kept: Rev 3:10, Rev 22:7; Joh 14:21-24, Joh 15:20, Joh 17:6; Ti2 4:7 and hast not: Rev 2:13; Pro 30:9; Mat 26:70-72; Luk 12:9; Act 3:13, Act 3:14; Ti1 5:8; Jo1 2:22, Jo1 2:23; Jde 1:4 Revelation 3:9”