God always had a Plan
God has a coherent plan for bringing salvation to the world. Each new covenant that he established was not designed to replace the old because it had failed, but an extension of the previous covenant to gain additional benefits for him and his people. The new covenant that Jesus established by his death and resurrection was the ultimate fulfilment of his plan.
God does not make mistakes, and he knows what he is doing, so his covenants did not fail. Each one achieved what he expected it to. Each one prepared the way for the next one.
The Rainbow covenant established with Noah gave God the authority to intervene when evil got out of hand. Placing a constraint on evil was a limited gain, but it was a start.
The covenant with Abraham created a people for God, but they did not yet have a land. He lived a wandering life, so he was relatively safe from spiritual attack if he stuck with God. Abraham created one nation, but God wanted all the people of the world.
The covenant with Moses established a land for the people with laws that enabled them to live in peace with each other in close quarters. By coming together in his way, they became vulnerable to spiritual attack, but the Tabernacle offerings provided spiritual protection for them if they stayed loyal to God. This covenant was a huge advance, but Moses only got one piece of land, whereas God wanted the entire earth. The Holy Spirit was active, but only on a few special people, mostly prophets. God wanted a broader range of ministries.
Jesus' ministry achieved everything that God needed done on earth and in the spiritual realms to achieve his purposes. This covenant was complete. Nothing was lacking, and nothing still needed to be done.
Jesus' death on the cross defeated the spiritual powers of evil by shedding the blood that they demanded as a ransom for setting humans free. The soldier pierced his side, and the blood ran down onto the ground where they wanted it. The blood was for the powers of evil, not for God. If Jesus had to die to appease God, he would have died in the temple, and his blood would have been put on the altar, but he died outside the city, where the powers of evil controlled the situation.
Having disarmed the powers and authorities, he made a public spectacle of them, triumphing over them by the cross (Col 2:15).
Once he had paid the ransom they demanded, they lost their authority over humans and over the earth.God vindicated Jesus by raising him from the dead (Col 1:19). The spiritual powers of evil were happy to give up their authority over humans in return for killing the Son of God. They believed that by killing him, God’s plans would be totally defeated. However, God foiled them by raising Jesus from the dead. From their point of view, this was a massive disaster because they had given up authority over the people of the world to destroy the Son of God, which seemed like a good deal, but then Jesus was raised, so they lost out twice, and were left powerless. They can never recover from this defeat.
Jesus came from the tribe of Judah, so he was not allowed to be a priest while living on earth (Heb 8:4). Rising from the dead qualified Jesus to be a priest after the order of Melchizedek, who had neither beginning of days nor end of life (Heb 7:3). Having become a priest in this order, Jesus was qualified to enter the heavenly holy of holies and bring an offering to God. He did not need to cleanse the heavenly tabernacle because it was already holy.
Ten days after he was raised from the dead, Jesus ascended into the spiritual realms to be with God, the Father. He passed “through the heavens” (Heb 7:14) and became a High Priest who can sympathise with our weakness. In him, we can boldly approach the throne of grace and obtain mercy and forgiveness. In response to Jesus' request, God agreed to have mercy and forgive everyone who trusts in him (Heb 7:15-16). He takes away our shame by saying that we are “OK”.
Jesus keeps on asking for mercy on our behalf. He has faced the same battles that we face and understands how difficult it is to serve God through the intense spiritual battle that is taking place on earth. He defends us from every accusation of the enemy.
Jesus sat down at the right hand of the Father, who appointed as King of Creation, far above all rule and every authority in both the spiritual and earthly realms (Heb 1:3; Eph 1:20-23).
Jesus threw the powers of evil out of their place in the spiritual realms where they had operated (Rev 12:7-12). Prior to the cross, they were able to go into God’s presence and accuse his people of sinning and demand that they be allowed to punish them. They lost that role when Jesus ascended into God’s presence. This is part of Jesus' intercession on our behalf.
Jesus poured the Holy Spirit out on his people. He released a much fuller manifestation of spiritual gifts. He released a broader range of ministries to strengthen the church (Acts 2:32-33; Eph 4:7-12).
Jesus organises the holy angels to support his people in their activities and ministry for him (Heb 1:14).