Rev. 3:7 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;
Jesus Is Holy. Isaiah 6:3 And one cried unto another, and said, Holy, holy, holy, is the LORD of hosts: the whole earth is full of his glory. See also Rev. 4:8. God certainly is holy, but also Jesus Christ is holy, because he is the express image of the Father. His holiness is pure holiness, not a holiness which can be described or understood by man's mind. Jesus is holy from his pre-existence throughout all eternity. When he was conceived, the angel said in Luke 1:35 . . . The Holy Ghost shall come upon thee, and the power of the Highest shall overshadow thee: therefore also that holy thing which shall be born of thee shall be called the Son of God.
Jesus Is True. Everything in Jesus' existence is the epitome of truth. Man cannot comprehend this kind of truth. He is the true Light (John 1:9). He is the true Bread from Heaven (John 6:32). His record (or testimony) is true (John 8:14). His judgment is true (John 8:16). He is the true Vine (John 15:1). He is full of grace and truth (John 1:14), for truth came by Jesus Christ (John 1:17). Pilate asked the question, "What is truth?" (John 18:38), Jesus said in John 14:6 . . . I am the way, the truth, and the life: no man cometh unto the Father, but by me.
Jesus Has The Key of David. He has this key in type, because he was portrayed by King David of old. He is to sit upon David's throne and rule with authority, thus depicting by the key the authority to administer his kingdom and to execute judgment. Jesus has complete authority over his kingdom and his churches. Therefore, it is with this authority that the churches of the Lord Jesus Christ are summoned to preach the Gospel of Christ to every creature. It is with this key that God's grace is bestowed upon every believer in Christ. It is with this key that Jesus summons preachers to preach his word and calls missionaries to fields of service. It is with this key that Jesus unlocked all the mysteries of future things of which he has currently only taught us through the Spirit of God. No man has this authority; only God can measure out this authority with perfection and execute it flawlessly. That is why He must open the door that no man can shut and shut the door that no man can open. His purpose is perfect, and no one can thwart that purpose (Dan. 4:35).