In the court room – the One who sits on the Throne has a book (a biblion – probably a very large codex; a set of scrolls together – the “book” as we know it did not even begin until the mid-2nd century AD) on his right side, symbolizing His power and authority. And a great angel – a powerful and strong angel (could be Gabriel – God’s messenger, as Gabriel means “God’s strong man”) calls out to all of creation – who is worthy? And no one is found.
John is upset and begins to weep because there is no one who is worthy to open the seals upon the book. There are seven – signifying perfection. But one of the elders assures John and tells him to look – for the Lion of Judah has overcome. But the Lion turns out to be a Lamb – slain with seven horns and seven eyes. The power of the Lion, the wonder of the Lion turns out to be the sacrifice of the Lamb! And He sends this out into the world through the Spirit – the seven spirits of God (meaning the Holy Spirit in perfection, I think). Interestingly, it is the Lamb who has the symbology of the seven, but the Spirit is of God, and it appears that He sends the Spirit(s) into the world. An argument for both the Western and the Eastern view of the addition to the Nicene Creed, I believe, can be made here. Originally, the Nicene-Constantipolitan Creed of 381 reads, regarding the Holy Spirit, “who proceeds from the Father” and later in the Middle Ages, the Pope commanded that they add “and the Son” to it – in Latin “filioque”and is even now a major division between Eastern and Western Christianity. The phrasing of the passage, in my opinion, supports the Eastern (original) Creed, while the symbol of 7 eyes and horns, being the seven spirits of God appear to be “on” or “in” the Lamb, supporting the Western. Regardless, the Lamb is the One who is worthy, who has overcome the Evil powers, who can open the seals that guard God’s will towards the earth (which is what it appears the biblion contains).
The Lamb comes forward and takes the book – without asking, without it being presented. He simply takes it. He knows His own worth! And the One on the Throne allows it. The elders, and everyone else, fall down and sing, praising the Lamb with a “new song.” It happens to begin exactly the same way as the older song in chapter 4 does – “worthy are You” – confirming the fundamental equality and sameness of the Lamb and the One on the Throne! Jesus IS God! He purchased us from among every nation and made them into a kingdom of priests! (that is, grafted them into Israel; see Romans 8-11) The elders and the living creatures and EVERYONE in heaven and on earth and below the earth – ALL of creation in numbers beyond counting (myriads on myriads and thousands upon thousands) sings to Jesus’ glory.
And then it is said “Amen” – let it be so; and they worshipped. Jesus was and is the second Person of the Trinity – He is God and worthy to be praised and worshipped and glorified. As we are on earth, that is part of our job. He, and only He, is worthy for this – what John’s vision is about to reveal.
Again, this is John’s vision of what will – is? – happening. It is difficult to say if it is future or present in the book – it is the vision. Regardless, the point of this is that the Lion conquered through the sacrifice of the Lamb – two juxtaposed animals that are both Jesus; and that He is worthy because of this sacrifice to rule and to be worshipped. He is indeed God. Nothing can defeat Him – but His power is in His weakness and sacrifice, not through brute strength. And He sends His power out into the world through and in the Spirit(s) of God.