Nope. what it means is that there is no end to eternity, for eternity is forever and is thus eternal. End of eternity is a choice for us to make, to bring an end to everything we talked about or to continue talking about everything.
it has nothing to do with purity. It has everything to do with choices we make in life. Choices that define who we are, choices that makes us eternal or forever dead.
If there is no eternity to be taken account for then there is eternity. If one believes there is only a limit to the threshold than nothing can be summoned.