While we look not at the things which are seen, but at the things which are not seen: for the things which are seen are temporal; but the things which are not seen are eternal. (II Cor. 4:16-18)
Life in Christ is received from above through the Holy Spirit. His life is not life that is of this world. But we do receive Him IN an earthen vessel. And despite the fact that our life is not OF this world, we do live in this world. We have to deal with our environment.
Once we receive Jesus Christ within, there is automatically created a conflict. All that He is in us stands contrary to all that we are in Adam. All that He is in us stands contrary to all that is around us in this world. This conflict will make our lives a battlefield. To the extent that we stand by faith in Christ we will suffer for His sake. It will, “bear about in our body the dying of the Lord Jesus,” then, “the life of the Lord Jesus will be made manifest in us.” (see II Cor. 4:10)
What Paul is telling us is this: All of our suffering will pass into history – and all of the circumstances over which we suffered will pass into history. But what will remain is what has been formed in us of Christ. It is for this purpose that God deals with us as He does: The eternal things not yet seen.