The key of David speaks of the government of the Lord Jesus Christ upon us. We shall have peace no end when we submit to His government in our lives as the King sits in judgment.
Isaiah 9:6-7 KJV (6) For unto us a child is born, unto us a son is given: and the government shall be upon his shoulder: and his name
shall be called Wonderful, Counsellor, The mighty God, The everlasting
Father, The Prince of Peace. (7) Of the increase of his government
and peace there shall be no end, upon the throne of David, and upon
his kingdom, to order it, and to establish it with judgment and with
justice from henceforth even for ever. The zeal of the LORD of hosts
will perform this.
He has the key of David. He that opens and no man shuts is about those whom He sends out in His name (authority) to speak (with an open mouth....the open door of utterance) His words in the Spirit of the Lord. He gives them a mouth and wisdom that the enemies cannot resist (no man can shut).
Luke 21:15 KJV (15) For I will give you a mouth and wisdom, which all your adversaries shall not be able to gainsay nor resist.
The Spirit of the LORD spoke through/by David's mouth. His Word was in his tongue.
2 Samuel 23:1-7 KJV (1) Now these be the last words of David. David the son of Jesse said, and the man who was raised up on high, the
anointed of the God of Jacob, and the sweet psalmist of Israel, said,
(2) The Spirit of the LORD spake by me, and his word was in my
tongue.
Another example: Stephen, who was full of faith and power, spoke His words of which the enemies could not withstand.
Acts 6:8-11 KJV (8) And Stephen, full of faith and power, did great wonders and miracles among the people. (9) Then there arose certain
of the synagogue, which is called the synagogue of the Libertines, and
Cyrenians, and Alexandrians, and of them of Cilicia and of Asia,
disputing with Stephen. (10) And they were not able to resist the
wisdom and the spirit by which he spake.
But when the enemies cannot win the debate (dispute) of the subject matter, they resort to false accusations and personal attacks. They "kill" the messengers of His words with their words of wrath. They use “strength” in their words with wrath and false accusations against the speaker and cannot/will not listen. They "gnash their teeth" in rage and stop up their ears.
(11) Then they suborned men, which said, We have heard him speak blasphemous words against Moses, and against God.
Yet the church in Philadelphia (brotherly love) shows us how to not deny His name ….His authority…His government. He is true....as His words are true...and we are to be holy as He is holy.
Revelation 3:7 KJV (7) 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;
The “open door” is the open door of utterance that speaks His true words in His name (authority). Blessed is he that comes in the name (authority ) of the Lord. Those who listen to the open door listens to Him and those who reject what is said rejects Him who speaks (see Luke 10:16).
He sets that open door of utterance before them and the church in Philadelphia who uses “little strength” towards what the open door is saying. They shut their mouths (he shuts and no man opens).
Kings will shut their mouths because of Him because what they were not told, they will see, and what they have not heard, they will understand. (see Isaiah 52:15).
The only way...the key... to entering in to understand what is being said in the "open door" is to shut the mouth (use "little strength" in words) and hear what the Spirit is saying.
The church in Philadelphia shows brotherly love and actively hears what the Spirit is saying through the “open door” that is opened by the Lord to speak to their hearing ears.
The church in Philadelphia are quick to hear and slow to speak and slow to wrath. They are meek (having little strength) towards the open door of utterance. They do not deny His name…His authority... but observe and keep it. They keep His Word by doing it in their lives towards what they hear the Spirit saying to their ears. they do not resist the Spirit but shut the mouth to hear.
(8) 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.
But those who “dwell upon the earth” will be tempted to speak out in strength (wrath, envy, strife, etc) towards what they hear what the “open door” has to say.
Revelation 3:10 KJV (10) 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.
Those who “dwell upon the earth” (dwelling on the earthly wisdom: envy, strife, wrath, covetousness, etc) will not be focusing on those things above (the wisdom from above: peace, love, joy, patience, gentleness, etc) and they are caught by surprise by those who are sent out in His authority to speak His words to their ears via the “open door” of utterance.
They will not be found “watching” but “asleep” to His righteousness and will be tempted to speak out in wrath towards what they hear the Spirit saying. Those who cannot overcome do not enter into the understanding but are left outside in the "darkness". The wicked shall not understand while the righteous enter in to understand the mysteries of the kingdom.
Colossians 3:5-6 KJV (5) Mortify therefore your members which are upon the earth; fornication, uncleanness, inordinate affection, evil
concupiscence, and covetousness, which is idolatry: (6) For which
things' sake the wrath of God cometh on the children of disobedience:
In summation, the key of David is about His government and submitting to that government which is the key to entering into His door of understanding/knowledge as He opens up the Scriptures to our hearing ears (He that hath an ear, let him hear what the Spirit saith unto the churches) via those who are sent out in His authority to speak His true words....with the "open door" of utterance. The "open door"...the open mouth that speaks via the Spirit...is to be met with little resistance (little strength, the shut mouth) in response and yielding to His government.
Thanks for reading and considering.