Romans 8:19

“The creation waits in eager expectation for the sons of God to be revealed.”

Most people don’t realise it, but Jesus’ redemptive work affects far more than just us as a group of believers. In fact, by His work, He has paid the price to redeem all creation from the curse.
Just as Adam’s sin affected the earth, causing thorns and thistles to grow, introducing death, decay, and disease, Christ’s work effectively undoes all of that. And the creation knows this. It knows that one day, when we are made perfect, all things will be made new. These are all tied up together.
We, the sons (and daughters) of God, will be revealed in our resurrection bodies when Jesus comes back to earth to establish His Kingdom. In that day, it won’t be a crowd of people who simply say they are believers, but those who actually believe. The tares will have been separated out from the wheat (Matt. 13:24-30, Matt. 13:40-43). This is what it means ‘for the sons of God to be revealed’. Jesus returns to earth to set up His Kingdom and reign for a thousand years. During that time, according to the Scriptures, the earth seems to return to a pre-Fall state. Satan is bound, and creation is restored (Isa. 65:25). No wonder creation is waiting eagerly for that day!