“Freedom has a thousand charms to show,
That slaves, howe'er contented, never know.”

Variant: The one charm about the past is that it is the past.
Source: The Picture of Dorian Gray

Source: Listen, Little Man!

Attributed to Tubman in Dorothy Winbush Riley, My Soul Looks Back 'Less I Forget https://books.google.com/books?id=KpcLAQAAMAAJ&focus=searchwithinvolume&q=%22c.+1865%22 p. 148 (1993). Riley gives a date of "c. 1865" but offers no citation. No source from earlier than 1993 is known. Quoted in Africana: The Encyclopedia of the African and African American Experience (1999) by Henry Louis Gates and Kwame Anthony Appiah, p. 299. Tubman specialists like Jean H. Humez and Kate Clifford Larson deem this one completely spurious. See "Bogus Tubman," by Steve Perisho http://liberlocorumcommunium.blogspot.com/2014/03/bogus-tubman-i-freed-thousands-of.html.<!-- Someone cited this as being in Harriet, The Moses of Her People (1886) by Sarah H. Bradford, but it does not occur in the editions available online. -->
Disputed
Variant: I freed thousands of slaves. I could have freed thousands more, if they had known they were slaves.

Source: Memoirs of a Superfluous Man (1943), p. 314
Context: According to my observations, mankind are among the most easily tamable and domesticable of all creatures in the animal world. They are readily reducible to submission, so readily conditionable (to coin a word) as to exhibit an almost incredibly enduring patience under restraint and oppression of the most flagrant character. So far are they from displaying any overweening love of freedom that they show a singular contentment with a condition of servitorship, often showing a curious canine pride in it, and again often simply unaware that they are existing in that condition.

Wer es versteht, den Leuten mit Anmut und Behagen Dinge auseinander zu setzen, die sie ohnehin wissen, der verschafft sich am geschwindesten den Ruf eines gescheiten Menschen.
Source: Aphorisms (1880/1893), p. 37.

Egyptian high priest, Book X, line 90
The Odyssey : A Modern Sequel (1938)
Context: A slave's soul has no worth, my brothers; it lacks strength
to tread on this great earth with gallantry and freedom.
I pity the poor slaves, they're nought but airy mist,
a light breeze scatters them, a fragrance knocks them down;
it's only just they crawl on the earth on hands and knees.
Today I'll write a hymn to God and pray for this great grace.

Original text: Qui cherche dans la liberté autre chose qu'elle-même est fait pour servir.
Variant translation: The man who asks of freedom anything other than itself is born to be a slave.
Old Regime (1856), p. 204 http://books.google.com/books?id=N50aibeL8BAC&pg=PA204&vq=%22He+who+seeks+freedom%22&source=gbs_search_r&cad=1_1
1850s and later

Source: Cry, the Beloved Country

Harijan (24 February 1946). As quoted in The Politics Of Nonviolent Action, Gene Sharp, Porter Sargent Publishers (1973), p. 59
1940s