And to the angel of the church in Philadelphia write; These things saith he that is holy, he that is true, he that hath the key of David, he that openeth, and no man shutteth; and shutteth, and no man openeth; I know thy works: behold, I have set before thee an open door, and no man can shut it: for thou hast a little strength, and hast kept my word, and hast not denied my name. Behold, I will make them of the synagogue of Satan, which say they are Jews, and are not, but do lie; behold, I will make them to come and worship before thy feet, and to know that I have loved thee. Because thou hast kept the word of my patience, I also will keep thee from the hour of temptation, which shall come upon all the world, to try them that dwell upon the earth. Behold, I come quickly: hold that fast which thou hast, that no man take thy crown. Him that overcometh will I make a pillar in the temple of my God, and he shall go no more out: and I will write upon him the name of my God, and the name of the city of my God, which is new Jerusalem, which cometh down out of heaven from my God: and I will write upon him my new name. He that hath an ear, let him hear what the Spirit saith unto the churches.
Revelation 3:7-13
Our Lord and Savior Jesus Christ is the supreme Head of the Church. He is in the midst of the candle sticks and in His hands are the angels of the church. Only He knows the Church perfectly well and only He can give the perfect and accurate spiritual condition of the Church in general and any individual congregation. His assessment is perfect. We can all learn, grow, and humbly and patiently improve in any areas we need to improve. Correction is good, humble reflection and desire to know from the Lord how we are doing is healthy. Better to be corrected, chastised, and pruned than to perish at last.