But it was not in God's original plan. He intended for man to live forever in perfect fellowship with Him. Then sin entered the human race and man began to die - spiritually and physically. But Adam ignored the warning, disobeyed God, and died spiritually. Physical death did not come until more than 900 years later.
Physical death does two things.
First, it terminates all earthly plans. Most people will agree they put too much time on earthly pursuits. Paul says in 1 Cor. Then shall be brought to pass the saying that is written, Death is swallowed up in victory. Second, death terminates our day of grace.