This was the first look at the inside of "The Q Continuum" in the Star Trek universe. For one "Q", having godlike powers and immortality isn't all that it's cracked up to be. He wants to die.
Janeway visits the "Continuum" and weighs the pros and cons about eternal life in an advanced civilization. In the end, she rules for the rights of the individual over the group. "No one should have immortality forced on themselves if they don't want it."
I see a parallel between this episode and the original "Brotherhood Of Christ." The "sons of God" misused their powers and probably became bored with immortality. The divine solution for these sins and idle behavior was to incarnate these prodigals into the human race where they would lose their powers and forget who they were. They would die as spiritual beings.
As the Apostle Paul stated in the New Testament, "As in Adam, all die, so in Christ, all will be made alive." With the help of Christ, our memories will be returned to us of the present life and any earlier life. Like prodigal sons and daughters, we will return home.