An eternal life is a worthless life.

[John V]

By definition, if you have an eternal life, you have sufficient time to do everything there is to do, and then continue to do all of those things until you get so bored of them you can't stand to do them anymore. And you still wouldn't be even half done living.

That only follows if "everything there is to do" is finite. If new things to do are being continually invented, then this argument doesn't hold up.