“The American slave was treated like property, which is to say, pretty well.”

1860s, Speech at Hartford (1860)

2000s, The Real Abraham Lincoln: A Debate (2002), Q&A

A Human Being Cannot Be Justly Owned (1835)
Context: The slave-holder claims the slave as his Property. The very idea of a slave is, that he belongs to another, that he is bound to live and labor for another, to be another’s instrument, and to make another’s will his habitual law, however adverse to his own. Another owns him, and, of course, has a right to his time and strength, a right to the fruits of his labor, a right to task him without his consent, and to determine the kind and duration of his toil, a right to confine him to any bounds, a right to extort the required work by stripes, a right, in a word, to use him as a tool, without contract, against his will, and in denial of his right to dispose of himself, or to use his power for his own good. “A slave,” says the Louisiana code, “is in the power of the master to whom he belongs. The master may sell him, dispose of his person, his industry, his labor; he can do nothing, possess nothing, nor acquire any thing, but which must belong to his master.” “Slaves shall be deemed, taken, reputed, and adjudged,” say the South-Carolina laws, “to be chattels personal in the hands of their masters, and possessions to all intents and purposes whatsoever.” Such is slavery, a claim to man as property. Now this claim of property in a human being is altogether false, groundless. No such right of man in man can exist. A human being cannot be justly owned. To hold and treat him as property is to inflict a great wrong, to incur the guilt of oppression.

Letter to Gerrit Smith, (Feb. 7, 1835), The Letters of William Lloyd Garrison, vol. 1, Walter M. Merrill, edit., Belknap Press-Harvard University Press, 1971, p. 445

Capitalism: A Treatise on Economics (1996)

Myth at the end of Julian's oration to the cynic Heracleios, as translated in The Emperor Julian : Paganism and Christianity (1879) http://www.third-millennium-library.com/MedievalHistory/Julian_the_Emperor/CHAPTER_VI.html by Gerald Henry Rendall, Ch. VI : Julian's Personal Religion, p. 138
General sources
Context: "Suppose that I and Athene, at the behest of Zeus", said Helios, "were to make you steward of all these in the room of him that hath the inheritance." Then the young man clung to him once more, and besought him greatly that he might remain there. But he said, "Be not very rebellious, lest the excess of my love be turned to the fierceness of hatred."
So the young man answered, "Most mighty Helios, and thee Athene, and Zeus himself, I do adjure, do with me what ye will."
After this Hermes, suddenly reappearing, filled him with new courage, for now he thought he had found a guide for his return journey, and his sojourn on earth. And Athene said, "Listen, most goodly child of mine and of this good sire divine! This heir, you see, finds no pleasure in the best of his shepherds, while the flatterers and rogues have made him their subject and slave. Consequently the good love him not, while his supposed friends wrong and injure him most fatally. Take heed therefore when you return, not to put the flatterer before the friend. Give ear, my son, to yet a second admonition. Yon sleeper is habitually deceived; do you therefore be sober and watch, that the flatterer may never deceive and cheat you by a show of friendly candor, just as some sooty and grimy smith by dressing in white and plastering his cheeks with enamel might finally induce you to give him one of your daughters to wife. List now to a third admonition. Set a strong watch upon yourself: reverence us and us alone, and of men him that is like us and none other. You see what tricks self-consciousness and dumb-foundering faint-heartedness have played with yonder idiot." Great Helios here took up the discourse and said, "Choose your friends, then treat them as friends; do not regard them like slaves or servants, but associate with them frankly and simply and generously; not saying one thing of them and thinking something else. See how distrust towards friends has damaged yonder heritor. Love your subjects as we love you. Let respect toward us take precedence of all goods: for we are your benefactors and friends and saviours."
At these words the young man's heart was full, and he made ready there and then to obey the Gods implicitly always. "Away, then", said Helios, "and good hope go with you. For we shall be with you everywhere, I and Athene and Hermes here, and with us all the Gods that are in Olympus, and Gods of the air and of the earth, and all manner of deities everywhere, so long as you are holy toward us, loyal to your friends, kindly to your subjects, ruling and guiding them for their good. Never yield yourself a slave to your own desires or theirs. …"

Vol. I, p. 268
William Lloyd Garrison 1805-1879 (1885)

Source: The Cave (2000), p. 21 (Vintage 2003)