"Nature, which favours to the few
All art beyond imparts,
To him presented at his birth
The key of human hearts."
Wakefield cites _Comus_, 12:
"Yet some there be, that with due steps aspire
To lay their hands upon that golden key
That opes the palace of eternity."
See also _Lycidas_, 110:
"Two massy keys he bore of metals twain;
The golden opes, the iron shuts amain."