The temple to which the LORD suddenly comes is the human body, and the coming is the descent of awakened consciousness into its own dwelling of flesh. The messenger who prepares the way is the forerunning force in a person, the stirring current that clears the passage so the higher self can enter its house. What is sought as a distant lord is already the tenant of the temple standing within, and its arrival is sudden because inner realization breaks in without warning once the way is cleared. The whole event is interior, the divine light returning to the bodily sanctuary built to hold it.
The one long awaited comes not to a building of stone but to the temple of the body, arriving all at once in the person prepared to receive it.
The messenger: the forerunning inner force that clears the passage for the higher self to enter
The temple: the human body, the living sanctuary into which the awakened consciousness descends