Of all the harsh consequences of sin, death has been the most persistent. Sin can be overcome, Satan can be resisted, but with just two known exceptions (Enoch, Elijah) out of billions, who has escaped the inevitability of death? When it comes to death, wrote an ancient philosopher, we human beings all live in an unwalled city.
With the power ascribed to death, it is no wonder that just before Christ establishes the Messianic kingdom on earth, He will first utterly destroy death.
There is no question that death is related to sin, which means it’s related to God’s law, as well; because sin is violation of God’s law. Consequently, there can be no sin without the law. Although sin is dependent on the law, the law is independent of sin. That is, the law can exist without sin. In fact, it did so for all the ages until Lucifer rebelled in heaven.
When Satan rebelled against the law of Jehovah, the thought that there was a law came to the angels almost as an awakening to something unthought of. In their ministry the angels are not as servants, but as sons. There is perfect unity between them and their Creator.-Ellen G. White, Thoughts From the Mount of Blessing, p. 109.
With this in mind, the absence of death and sin in the kingdom of God does not require the absence of the law. Just as the law of gravity is necessary for the harmonious interaction between the physical elements of the universe, God’s moral law is needed to govern the righteous interaction between the saints. When God inscribes His law in the hearts of the redeemed, His sole purpose is to seal their decision to walk in the way of righteousness for eternity. Consequently, His law becomes the very essence of His kingdom. So, we have every reason to believe that the principles of God’s moral law will exist in God’s eternal kingdom. The difference, of course, is that those principles will never be violated there as they have been here.
Try to imagine the perfect environment of heaven: no fallen natures, no devil to tempt us, no sin, and no death. Now ask yourself: what things in your life and character would not fit very comfortably in such an environment?