Will the United Nations and human institutions solve all the world's problems?
No. Human institutions such as the United Nations will not solve all the world's problems. Scripture indicates the world may think it will keep going forever, but there will be no peace on earth until the Prince of Peace comes. Praying for Jerusalem's peace means praying for the Lord's coming.
Les explains that the world may think it will keep going forever and that the United Nations and all these things are going to solve all the world's problems. But that is not so. There is not going to be peace on this earth until the Prince of Peace comes. He also teaches that the Psalm's command to pray for the peace of Jerusalem means to pray for the Lord's coming, because Jerusalem will have no peace until the Prince of Peace is back in Jerusalem. So when you pray for the peace of Jerusalem, you are praying, 'Lord come quickly.' The context adds that when He comes, believers shall be like Him, for they shall see Him as He is.