“Property is robbery! That is the war-cry of '93! That is the signal of revolutions!
Reader, calm yourself: I am no agent of discord, no firebrand of sedition. I anticipate history by a few days; I disclose a truth whose development we may try in vain to arrest; I write the preamble of our future constitution. This proposition which seems to you blasphemous — property is robbery — would, if our prejudices allowed us to consider it, be recognized as the lightning-rod to shield us from the coming thunderbolt; but too many interests stand in the way! … Alas! philosophy will not change the course of events: destiny will fulfill itself regardless of prophecy. Besides, must not justice be done and our education be finished?”

Letter to http://memory.loc.gov/cgi-bin/query/r?ammem/mtj:@field(DOCID+@lit(tj110158)) Thomas Leiper (12 June 1815). Published in The Works of Thomas Jefferson in Twelve Volumes http://oll.libertyfund.org/ToC/0054.php, Federal Edition, Paul Leicester Ford, ed., New York: G. P. Putnam's Sons, 1904, Vol. 11 http://oll.libertyfund.org/Texts/Jefferson0136/Works/0054-11_Bk.pdf, pp. 477–478.
The sentence "I hope our wisdom will grow with our power, and teach us, that the less we use our power, the greater it will be." was used by US-President Barack Obama in his A New Beginning Speech.
1810s
Context: We concur in considering the government of England as totally without morality, insolent beyond bearing, inflated with vanity and ambition, aiming at the exclusive dominion of the sea, lost in corruption, of deep-rooted hatred towards us, hostile to liberty wherever it endeavors to show its head, and the eternal disturber of the peace of the world. In our estimate of Bonaparte, I suspect we differ. [... ] Our form of government is odious to him, as a standing contrast between republican and despotic rule; and as much from that hatred, as from ignorance in political economy, he had excluded intercourse between us and his people, by prohibiting the only articles they wanted from us, that is, cotton and tobacco. Whether the war we have had with England, and the achievements of that war, and the hope that we may become his instruments and partisans against that enemy, may induce him, in future, to tolerate our commercial intercourse with his people, is still to be seen. For my part, I wish that all nations may recover and retain their independence; that those which are overgrown may not advance beyond safe measures of power, that a salutary balance may be ever maintained among nations, and that our peace, commerce, and friendship, may be sought and cultivated by all. It is our business to manufacture for ourselves whatever we can, to keep our markets open for what we can spare or want; and the less we have to do with the amities or enmities of Europe, the better. Not in our day, but at no distant one, we may shake a rod over the heads of all, which may make the stoutest of them tremble. But I hope our wisdom will grow with our power, and teach us, that the less we use our power, the greater it will be.

Source: Erewhon (1872), Ch. 12

http://www.gothamgazette.com/searchlight/2004.state.of.city.bloomberg.shtml
Why He Was Elected Mayor

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Original: "Otóż przeciwnie – to my jesteśmy jej własnością, ponieważ nie jesteśmy w stanie dokonać w niej zmian, ona natomiast wypełnia całość naszego istnienia."

Source: What is Property? (1840), Ch. I: "Method Pursued in this Work. The Idea of a Revolution"
Context: If I were asked to answer the following question: What is slavery? and I should answer in one word, It is murder, my meaning would be understood at once. No extended argument would be required to show that the power to take from a man his thought, his will, his personality, is a power of life and death; and that to enslave a man is to kill him. Why, then, to this other question: What is property! may I not likewise answer, It is robbery, without the certainty of being misunderstood; the second proposition being no other than a transformation of the first?
I undertake to discuss the vital principle of our government and our institutions, property: I am in my right. I may be mistaken in the conclusion which shall result from my investigations: I am in my right. I think best to place the last thought of my book first: still am I in my right.

1910s, The New Nationalism (1910)
Context: Conservation means development as much as it does protection. I recognize the right and duty of this generation to develop and use the natural resources of our land; but I do not recognize the right to waste them, or to rob, by wasteful use, the generations that come after us. I ask nothing of the nation except that it so behave as each farmer here behaves with reference to his own children. That farmer is a poor creature who skins the land and leaves it worthless to his children. The farmer is a good farmer who, having enabled the land to support himself and to provide for the education of his children, leaves it to them a little better than he found it himself. I believe the same thing of a nation.

1860s, Letter to James C. Conkling (1863)
Context: You dislike the emancipation proclamation; and, perhaps, would have it retracted. You say it is unconstitutional — I think differently. I think the constitution invests its commander-in-chief, with the law of war, in time of war. The most that can be said, if so much, is, that slaves are property. Is there — has there ever been — any question that by the law of war, property, both of enemies and friends, may be taken when needed? And is it not needed whenever taking it, helps us, or hurts the enemy? Armies, the world over, destroy enemies' property when they can not use it; and even destroy their own to keep it from the enemy. Civilized belligerents do all in their power to help themselves, or hurt the enemy, except a few things regarded as barbarous or cruel. Among the exceptions are the massacre of vanquished foes, and non-combatants, male and female.

As quoted in His Brother's Blood: Speeches and Writings, 1838–64 https://books.google.com/books?id=qMEv8DNXVbIC&pg=PA199 (2004), edited by William Frederick Moore and Jane Ann Moore, p. 199
1860s, Speech to the U.S. House of Representatives (April 1860)

Le Libertaire, No. 6, September 21, 1858 ( French http://joseph.dejacque.free.fr/libertaire/n06/lib01.htm; English http://libertarian-labyrinth.blogspot.com/2011/12/joseph-dejacque-on-exchange.html)