“Liberty is never unalienable; it must be redeemed regularly with the blood of patriots or it always vanishes. Of all the so-called natural human rights that have ever been invented, liberty is least likely to be cheap and is never free of cost.”

Speech regarding Civil Liberties and the War on Terrorism (November 20, 2006)

An essay on the slavery and commerce of the human species, particularly the African, translated from a Latin Dissertation, p. 54 (1788) https://books.google.com/books?id=pBOe7105MhMC&pg=PA54

1830s, The Lyceum Address (1838)
Context: Let every American, every lover of liberty, every well-wisher to his posterity swear by the blood of the Revolution never to violate in the least particular the laws of the country, and never to tolerate their violation by others. As the patriots of seventy-six did to the support of the Declaration of Independence, so to the support of the Constitution and laws let every American pledge his life, his property, and his sacred honor — let every man remember that to violate the law is to trample on the blood of his father, and to tear the charter of his own and his children's liberty. Let reverence for the laws be breathed by every American mother to the lisping babe that prattles on her lap; let it be taught in schools, in seminaries, and in colleges; let it be written in primers, spelling-books, and in almanacs; let it be preached from the pulpit, proclaimed in legislative halls, and enforced in courts of justice. And, in short, let it become the political religion of the nation; and let the old and the young, the rich and the poor, the grave and the gay of all sexes and tongues and colors and conditions, sacrifice unceasingly upon its altars. While ever a state of feeling such as this shall universally or even very generally prevail throughout the nation, vain will be every effort, and fruitless every attempt, to subvert our national freedom.

Source: What is Property? (1840), Ch. I: "Method Pursued in this Work. The Idea of a Revolution"
Context: I have made every effort to obtain exact information, comparing doctrines, replying to objections, continually constructing equations and reductions from arguments, and weighing thousands of syllogisms in the scales of the most rigorous logic. In this laborious work, I have collected many interesting facts which I shall share with my friends and the public as soon as I have leisure. But I must say that I recognized at once that we had never understood the meaning of these words, so common and yet so sacred: Justice, equity, liberty; that concerning each of these principles our ideas have been utterly obscure; and, in fact, that this ignorance was the sole cause, both of the poverty that devours us, and of all the calamities that have ever afflicted the human race.

Regarding using the words "slave" or "slaver" in the U.S. Constitution (25 August 1787); as quoted in "The Present Aspect of the Slavery Question" in Orations and Addresses of George William Curtis (1894), p. 69 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
1780s, The Debates in the Federal Convention (1787)

The Devil's Dictionary (1911)

Neverlution (2011)

On Facebook September 29, 2015
2010s

2016