“Of my Base metal may be filed a Key,
That shall unlock the Door he howls without.”
Omar Khayyám (1048–1131) Persian poet, philosopher, mathematician, and astronomer
The Rubaiyat (1120)
Context: The Vine had struck a fibre: which about
If clings my being — let the Dervish flout;
Of my Base metal may be filed a Key,
That shall unlock the Door he howls without.