“They believe that the Congress of the United States has no power under the Constitution to interfere with the institution of slavery in the different States.”

Source: Look Away!: A History of the Confederate States of America (2002), pp. 97–98

Speech before Congress (3 December 1860).
Context: The course of events is so rapidly hastening forward that the emergency may soon arise when you may be called upon to decide the momentous question whether you possess the power by force of arms to compel a State to remain in the Union. I should feel myself recreant to my duty were I not to express an opinion on this important subject.
The question fairly stated is, Has the Constitution delegated to Congress the power to coerce a State into submission which is attempting to withdraw or has actually withdrawn from the Confederacy? If answered in the affirmative, it must be on the principle that the power has been conferred upon Congress to declare and to make war against a State. After much serious reflection I have arrived at the conclusion that no such power has been delegated to Congress or to any other department of the Federal Government. It is manifest upon an inspection of the Constitution that this is not among the specific and enumerated powers granted to Congress, and it is equally apparent that its exercise is not "necessary and proper for carrying into execution" any one of these powers. So far from this power having been delegated to Congress, it was expressly refused by the Convention which framed the Constitution.

First Debate with Stephen Douglas in the Lincoln-Douglas debates http://www.bartleby.com/251/ of the 1858 campaign for the U.S. Senate, at Ottawa, Illinois (21 August 1858). Lincoln later quoted himself and repeated this statement in his first Inaugural Address (4 March 1861) to emphasize that any acts of secession were over-reactions to his election. During the war which followed his election he eventually declared the Emancipation Proclamation, freeing the slaves in those states in rebellion against the union, arguably as a war measure rather than as an entirely political or moral initiative.
1850s, Lincoln–Douglas debates (1858)

Proposed amendment https://books.google.com/books?id=pmZEAQAAIAAJ&pg=PA24&dq=%22james+madison%22+%22property+in+man%22&hl=en&sa=X&ved=0ahUKEwiwiczw5s_LAhVMOT4KHaM8CdMQ6AEINDAA#v=onepage&q=%22james%20madison%22%20%22property%20in%20man%22&f=false (8 April 1864)

Lincoln never said these words, but wrote and said some that are very similar to the above quote. As Lincoln's popularity within the Republican Party grew, he was invited to address members of his party throughout the nation. In September 1859 Lincoln gave several speeches to Ohio Republicans. The notes Lincoln used for his 1859 engagements state: "We must not disturb slavery in the states where it exists, because the Constitution, and the peace of the country both forbid us — We must not withhold an efficient fugitive slave law, because the constitution demands it — But we must, by a national policy, prevent the spread of slavery into new territories, or free states, because the constitution does not forbid us, and the general welfare does demand such prevention — We must prevent the revival of the African slave trade, because the constitution does not forbid us, and the general welfare does require the prevention — We must prevent these things being done, by either congresses or courts — The people — the people — are the rightful masters of both Congresses, and courts — not to overthrow the Constitution, but to overthrow the men who pervert it —" Source: Abraham Lincoln [September 16-17, 1859<nowiki> http://memory.loc.gov/cgi-bin/query/r?ammem/mal:@field(DOCID+@lit(d0189300))#I379</nowiki>] (Notes for Speech in Kansas and Ohio) http://memory.loc.gov/cgi-bin/ampage?collId=mal&fileName=mal1/018/0189300/malpage.db&recNum=1 in "Abraham Lincoln Papers at the Library of Congress. Series 1. General Correspondence. 1833-1916." Transcribed and Annotated by the Lincoln Studies Center, Knox College. Galesburg, Illinois. Lincoln transformed his prior quoted notes in the following words: "I say that we must not interfere with the institution of slavery in the States where it exists, because the Constitution forbids it, and the general welfare does not require us to do so. We must not withhold an efficient Fugitive Slave law, because the Constitution requires us, as I understand it, not to withhold such a law. But we must prevent the outspreading of the institution, because neither the Constitution nor general welfare requires us to extend it. We must prevent the revival of the African slave trade, and the enacting by Congress of a Territorial slave code. We must prevent each of these things being done by either Congresses or courts. The people of these United States are the rightful masters of both Congresses and courts, not to overthrow the Constitution, but to overthrow the men who pervert the Constitution." Source: Speech at Cincinnati, Ohio, September 17, 1859 http://www.gutenberg.org/dirs/3/2/5/3253/3253-h/files/2657/2657-h/2657-h.htm#2H_4_0043; in "The Papers And Writings Of Abraham Lincoln, Volume Five, Constitutional Edition", edited by Arthur Brooks Lapsley and released as " The Project Gutenberg EBook of The Papers And Writings Of Abraham Lincoln, Volume Five, by Abraham Lincoln http://www.gutenberg.org/dirs/3/2/5/3253/3253-h/files/2657/2657-h/2657-h.htm" (2009) by Project Gutenberg.
Ref: en.wikiquote.org - Abraham Lincoln / Disputed
1850s

To take a single step beyond the boundaries thus specially drawn around the powers of Congress, is to take possession of a boundless field of power, no longer susceptible of any definition.
The incorporation of a bank, and the powers assumed by this bill, have not, in my opinion, been delegated to the United States, by the Constitution... They are not among the powers specially enumerated...
Opinion against the constitutionality of a National Bank (1791), also quoted in The Writings of Thomas Jefferson "Memorial Edition" (20 Vols., 1903-04) edited by Andrew A. Lipscomb and Albert Ellery Bergh, Vol. 3, p. 146
1790s

1920s, Ordered Liberty and World Peace (1924)

" Whodunit? Who Meddled With Out Democracy? https://www.unz.com/imercer/whodunit-who-meddled-with-our-democracy/" February 8, 2018, The Unz Review.
2010s, 2018

AP report with lead summarizing of remarks stating "Robert F. Kennedy said yesterday that the United States — despite Alabama violence — is moving so fast in race relations a Negro could be President in 40 years." "Negro President in 40 Years?" in Montreal Gazette (27 May 1961) http://news.google.com/newspapers?nid=1946&dat=19610527&id=y40tAAAAIBAJ&sjid=F50FAAAAIBAJ&pg=5424,5208719
Context: The Irish were not wanted there [when his grandfather came to Boston]. Now an Irish Catholic is president of the United States … There is no question about it. In the next 40 years a Negro can achieve the same position that my brother has. … We have tried to make progress and we are making progress … we are not going to accept the status quo. … The United States Government has taken steps to make sure that the constitution of the United States applies to all individuals.