“Tyranny is Tyranny, let it come from whom it may.”

Source: An Introduction to the Principles of Morals and Legislation (1789; 1823), Ch. 17 : Of the Limits of the Penal Branch of Jurisprudence
Context: The day has been, I grieve to say in many places it is not yet past, in which the greater part of the species, under the denomination of slaves, have been treated by the law exactly upon the same footing as, in England for example, the inferior races of animals are still. The day may come when the rest of the animal creation may acquire those rights which never could have been withholden from them but by the hand of tyranny. The French have already discovered that the blackness of the skin is no reason why a human being should be abandoned without redress to the caprice of a tormentor. It may one day come to be recognized that the number of legs, the villosity of the skin, or the termination of the os sacrum are reasons equally insufficient for abandoning a sensitive being to the same fate. What else is it that should trace the insuperable line? Is it the faculty of reason, or perhaps the faculty of discourse? But a full-grown horse or dog is beyond comparison a more rational, as well as a more conversable animal, than an infant of a day or a week or even a month, old. But suppose they were otherwise, what would it avail? The question is not Can they reason?, nor Can they talk?, but Can they suffer?

Letter to Thomas Mercer
Undated

No. 7, line 6
Holy Sonnets (1633)

Ends and Means (1937)

Sir Robert Peel
Biographical Studies (1907)

This appears to be a manufactured quote for a PBS documentary on the American Revolution, created by condensing, rewriting, and paraphrasing portions of a lengthy letter James Madison wrote to Thomas Jefferson on 17 October 1788 http://oll.libertyfund.org/?option=com_staticxt&staticfile=show.php%3Ftitle=1937&chapter=118854&layout=html&Itemid=27, about the need for a Bill of Rights and the danger of an establishment of religion. The resulting "quote" profoundly changed the import of what Madison was trying to say and uses modern English. The phrases "biggest danger" and "tyranny of the majority" aren't even in the original letter. The relevant portions of the original letter are (italics in the original; bold added for emphasis):<blockquote>"… In Virginia I have seen the bill of rights violated in every instance where it has been opposed to a popular current. Notwithstanding the explicit provision contained in that instrument for the rights of Conscience, it is well known that a religious establishment would have taken place in that State, if the Legislative majority had found as they expected, a majority of the people in favor of the measure; and I am persuaded that if a majority of the people were now of one sect, the measure would still take place and on narrower ground than was then proposed, notwithstanding the additional obstacle which the law has since created. Wherever the real power in a Government lies, there is the danger of oppression. In our Governments the real power lies in the majority of the Community, and the invasion of private rights is chiefly to be apprehended, not from acts of Government contrary to the sense of its constituents, but from acts in which the Government is the mere instrument of the major number of the Constituents. This is a truth of great importance, but not yet sufficiently attended to; and is probably more strongly impressed on my mind by facts, and reflections suggested by them, than on yours which has contemplated abuses of power issuing from a very different quarter. Wherever there is an interest and power to do wrong, wrong will generally be done, and not less readily by a powerful & interested party than by a powerful and interested prince. …"</blockquote>
Misattributed

On Manners and Fashion
Essays on Education (1861)

Book 2, chapter 63: Pericles' third speech
History of the Peloponnesian War

Quoted in Atkins and Newman, Beecham Stories, 1978