Escatological Behavior

Peter said in Acts 2:16-21 that the "last days" began at Pentacost.

No, this is what was spoken by the prophet Joel: "In the last days, God says, I will pour out my Spirit on all people. Your sons and daughters will prophesy, your young men will see visions, your old men will dream dreams. Even on my servants, both men and women, I will pour out my Spirit in those days, and they will prophesy. I will show wonders in the heaven above and signs on the earth below, blood and fire and billows of smoke. The sun will be turned to darkness and the moon to blood before the coming of the great and glorious day of the Lord. And everyone who calls on the name of the Lord will be saved."

Since we see here that we are and have been in the "last days" for centuries, we can interpret  Isaiah 2:2-4 correctly.

Now it will come about that In the last days the mountain of the house of the LORD Will be established as the chief of the mountains, and will be raised above the hills; and all the nations will stream to it. And many peoples will come and say, "Come, let us go up to the mountain of the LORD, to the house of the God of Jacob; that He may teach us concerning His ways and that we may walk in His paths." For the law will go forth from Zion and the word of the LORD from Jerusalem. And He will judge between the nations, and will render decisions for many peoples; and they will hammer their swords into plowshares and their spears into pruning hooks. Nation will not lift up sword against nation, and never again will they learn war.

The implications of this verse are astounding. We think that things will get really bad before Jesus returns. This passage contradicts that belief. So we should be contending for a better world despite its current depraved state thus fulfilling Isaiah 60:1. How do we do this? One way is to not do what we've been doing. We must treat people the way Jesus treated them...

...namely, that God was in Christ reconciling the world to Himself, not counting their trespasses against them, and He has committed to us the word of reconciliation. Therefore, we are ambassadors for Christ, as though God were making an appeal through us; we beg you on behalf of Christ, be reconciled to God. He made Him who knew no sin to be sin on our behalf, so that we might become the righteousness of God in Him. [2 Corinthians 5:19-21]