The image Paul speaks of is not merely that we will be composed of spirit even as Christ is, but that our very nature and character be like His. If God desired that we merely be spirit, He could have made us like angels. Angels, however, are not God; they are angels. God is doing a work in us through which we will become like Him, not like angels.
His purpose requires that we cooperate. Though our part is very small by comparison to what He is doing, it is nonetheless vital. Notice how Paul draws this beautiful section of I Corinthians to a conclusion by drawing our attention to what it will take on our part to make God's purpose work: "But thanks be to God, who gives us the victory through our Lord Jesus Christ. Therefore, my beloved brethren, be steadfast, immovable, always abounding in the work of the Lord, knowing that your labor is not in vain in the Lord" (I Corinthians 15:57-58).
John W. Ritenbaugh
The Elements of Motivation (Part Three): Hope
Other Forerunner Commentary entries containing 1 Corinthians 15:48:
1 Corinthians 1:7-8
2 Corinthians 5:16-21