"Neither snow nor rain nor heat nor gloom of night
stays these couriers from the swift completion
of their appointed rounds."

Sentence inscribed on the wall by architects who designed the New York General Post Office.
It was taken from works of Herodotus and describes the expedition of the Greeks
against the Persians under Cyrus, about 500 B.C. The Persians operated a system
of mounted postal couriers, and the sentence describes the fidelity with which
their work was done.