Immanentize the eschaton

Immanentizing the eschaton is a phrase made famous by the writer and philosopher, Eric Voegelin. It means to try to make paradise on earth or create an earthly utopia, usually by political or social means. It's like trying to build a perfect world here on earth, instead of waiting for Heaven or something else in the afterlife. To put it in simpler terms, it's like trying to make something perfect here and now, rather than waiting for something special to happen later.