Key is word which refers to physical devices used to open locks such as those in adoor, or presentation devices which provideinformation necessary to properunderstanding of other things, such as a guide to a map, chart, graph, plot or diagram, or akey to a cryptography algorithm. Metaphorically, it is often applied to anything considered important or indispensable.
He is the Answerer,
What can be answer'd he answers, and what cannot be answer'd he shows how it cannot be answer'd.
A man is a summons and challenge,
(It is vain to skulk — do you hear that mocking andlaughter? do you hear theironical echoes?)
Books,friendships,philosophers, priests, action, pleasure, pride, beat up and down seeking to give satisfaction,
He indicates the satisfaction, and indicates them that beat up and down also.
Whichever the sex, whatever the season or place, he may go freshly and gently and safely by day or by night,
He has the pass-key of hearts, to him the response of the prying of hands on the knobs.
His welcome is universal, the flow ofbeauty is not more welcome or universal than he is,
The person he favors by day or sleeps with at night is blessed.