Mystery of Christ's body being revealed (Rev 10:7, Eph 1:9–10, Rom 1:16-17)

 When the seventh angel blows his trumpet, God’s mysterious plan will be fulfilled. It will happen just as he announced it to his servants the prophets.” Rev 10:7

Accept one another, then, just as Christ accepted you, in order to bring glory to God. Romans 15:7

The opened scroll (Rev 10:2), the voice from heaven spoke to me again: “Go and take the open scroll (Rev 10:8), and eat it (taste and see)... I was told, “You must prophesy again about many peoples, nations, languages, and kings.” (Rev 10:9-11).

Jesus was given all authority in heaven and heaven and sends us to go and make disciples, baptizing them in the name of the Father and of the Son and of the Holy Spirit (Matthew 28:17-20). This the little scroll was given to us to take to heart (Rev 10:1-10). To taste and see that the Lord is good. 

 - The Lamb conquered; He came; He has taken the roll. He is the wisdom of the Church; among all pre-eminent; all things will be reconciled in Him; the purpose and meaning of all life's mysteries and sorrows will be made plain in Him. (Comp. 1Corinthians 1:24; Ephesians 1:9-10; Colossians 1:18.) From Ellicott's Commentary for English Readers

...the spontaneous act of the Lamb in taking the book of his own accord as his right, with the call to St. John to take the little book (Revelation 10:8). Out of the right hand. The position of power and honour. He to whom all power was given in heaven and in earth (Matthew 28.) is the only One who can penetrate the mysteries and dispense the power of God's right hand. Of him that sat upon the throne; of him that sitteth. That is, the Triune God (see on Revelation 4:2). The Son in his human capacity, as indicated by his sacrificial form of the Lamb, can take and reveal the mysteries of the eternal Godhead in which he, as God, has part. From Pulpit Commentary

The gospel is the power of God for everyone who believes, the gospel reveals the righteousness of God that comes by faith. (Romans 1:16-17)

We who have tasted and seen the Lord is good are the body of Christ and his ambassadors on the earth. What this means is that we bind and lose in a very real sense. What we do and say has material consequences. Jesus taught this in John 13:20, "I tell you the truth, anyone who welcomes my messenger is welcoming me, and anyone who welcomes me is welcoming the Father who sent me."

When people work to destroy the church they are fighting God himself: See Acts 9:4-5, 

He fell to the ground and heard a voice say to him, “Saul, Saul, why do you persecute Me?” “Who are You, Lord?” Saul asked. “I am Jesus, whom you are persecuting,” He replied.

Jesus highlighted his own authority (before he died for our sins)

• so that all may honor the Son just as they honor the Father. Whoever does not honor the Son does not honor the Father who sent Him. John 5:23
• Then Jesus cried out, “Whoever believes in Me does not believe in Me alone, but in the One who sent Me. And whoever sees Me sees the One who sent Me. John 12:44-45
• Whoever does not love Me does not keep My words. The word that you hear is not My own, but it is from the Father who sent Me. John 14:24

Jesus highlighted his authority after the resurrection 

• "All authority in heaven and on earth has been given to me” Matthew 28:18
• Again Jesus said to them, “Peace be with you. As the Father has sent Me, so also I am sending you.” John 20:21

Jesus repeatedly taught this message about the Church

• As You sent Me into the world, I have also sent them into the world. John 17:18 
• Therefore, go and make disciples of all the nations, baptizing them in the name of the Father and the Son and the Holy Spirit. Matthew 28:19
• He who receives you receives Me, and he who receives Me receives the One who sent Me. Matthew 10:40
• Whoever listens to you listens to Me; whoever rejects you rejects Me; and whoever rejects Me rejects the One who sent Me.” Luke 10:16

And the apostles of God extended this message to us

• We are from God. Whoever knows God listens to us; whoever is not from God does not listen to us. That is how we know the Spirit of truth and the spirit of deception. 1 John 4:6
• Therefore we are ambassadors for Christ, as though God were making His appeal through us. We implore you on behalf of Christ: Be reconciled to God. 2 Corinthians 5:20 

The church is like a hospital

• And although my illness was a trial to you, you did not despise or reject me. Instead, you welcomed me as if I were an angel of God, as if I were Christ Jesus Himself. Galatians 4:14 
• The King will reply, 'Truly I tell you, whatever you did for one of the least of these brothers and sisters of mine, you did for me.' Matthew 25:40

The church is like a school

• And whoever welcomes a little child like this in My name welcomes Me. Matthew 18:5
• “Whoever welcomes one of these little children in My name welcomes Me, and whoever welcomes Me welcomes not only Me, but the One who sent Me.” Mark 9:37

Accept one another, then, just as Christ accepted you, in order to bring glory to God. Romans 15:7