Slavery is disheartening; but Nature is not so helpless but it can rid itself of every last wrong. But the spasms of nature are centuries and ages and will tax the faith of shortlived men. Slowly, slowly the Avenger comes, but comes surely. The proverbs of the nations affirm these delays, but affirm the arrival. They say, "God may consent, but not forever." The delay of the Divine Justice — this was the meaning and soul of the Greek Tragedy, — this was the soul of their religion.

"The Fugitive Slave Law", a lecture in New York City (7 March 1854), The Complete Works of Ralph Waldo Emerson (1904), p. 238.