What will the earth be delivered from?
The earth will be delivered from the power of Satan and the curse. This delivery is the prelude pictured in Matthew 24, where tribulation events serve as the birth pangs leading to the earth's release, because God will use those events to pay Satan off in full.
Les explains that Jesus is the only one in all eternity who could fulfill the requirements for this mortgage, because He is the next of kin, the Son of God, and He has the power and attributes to carry it out, and He is willing. He becomes the great payer of the mortgage Satan is holding. The beginning of sorrows in Matthew 24 is the beginning of the birth pangs coming on the earth as a prelude to the delivery from the curse. Les emphasizes that the earth is going to be delivered from the power of Satan and the curse, and these tribulation events are what God will use to pay Satan off in full. During the last seven years of Daniel chapter 9, Jews will face particular wrath, being delivered up, afflicted, killed, and hated by all nations; anti-Semitism will worsen, and many will be offended, betray one another, and hate one another.