“Slaves no doubt, but still men.”
Saturnalia (c. 400).
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Ambrosius Theodosius Macrobius 2
5th century European writer 370–430Related quotes

“Good slaves are free, but bad free men are slaves of many passions.”
As quoted by Stobaeus, iii.1.18

“So near at hand is freedom, and is anyone still a slave?”
Epistulae Morales ad Lucilium (Moral Letters to Lucilius), Letter LXXVII: On Taking One’s Own Life

“I want to die a slave to principles. Not to men.”
As quoted in Heroes of Mexico (1969) by Morris Rosenblum, p. 112
Variant: I want to die a slave to principles. Not to men.

Letter to the President of the English Society for Promoting the Manumission of Slaves http://www.vindicatingthefounders.com/library/jay-to-english-society.html (June 1788).
1780s

“What are men? Children who doubt.”
Source: The Odyssey

“Slaves, though held by the laws of men, are free by the laws of God.”
As quoted in "The Present Aspect of the Slavery Question" https://books.google.com/books?id=y3RaAAAAMAAJ&pg=PA69&dq=%22We+intend+this+Constitution+to+be+the+great+charter+of+human+liberty+to+the+unborn+%22&hl=en&sa=X&ved=0CB0Q6AEwAGoVChMI2ai6jcCsxwIVRRs-Ch38_wz2#v=onepage&q=%22We%20intend%20this%20Constitution%20to%20be%20the%20great%20charter%20of%20human%20liberty%20to%20the%20unborn%20%22&f=false (18 October 1859), by George William Curtis, Orations and Addresses of George William Curtis.

283 http://books.google.com/books?id=_GLTsGHUxDgC&lpg=PA171&dq=Today%20as%20always%2C%20men%20fall%20into%20two%20groups&pg=PA171#v=onepage&q&f=false
Human, All Too Human (1878)

“There exists in the minds of men a tone of feeling toward women as toward slaves.”
Woman in the Nineteenth Century (1845)