Some notable quotations by Thomas Jefferson:
"Man [is] a rational animal, endowed by nature with rights and with an innate sense of justice." --Thomas Jefferson to William Johnson, 1823. ME 15:441
"A free people [claim] their rights as derived from the laws of nature, and not as the gift of their chief magistrate." --Thomas Jefferson: Rights of British America, 1774. ME 1:209, Papers 1:134
"Under the law of nature, all men are born free, every one comes into the world with a right to his own person, which includes the liberty of moving and using it at his own will. This is what is called personal liberty, and is given him by the Author of nature, because necessary for his own sustenance." --Thomas Jefferson: Legal Argument, 1770. FE 1:376
"What is true of every member of the society, individually, is true of them all collectively; since the rights of the whole can be no more than the sum of the rights of the individuals." --Thomas Jefferson to James Madison, 1789.
"Nothing... is unchangeable but the inherent and unalienable rights of man." --Thomas Jefferson to John Cartwright, 1824. ME 16:48
James Madison drafted the Bill of Rights explaining that these were necessary to illustrate and protect the unalienable rights of the the people.
James Madison Speech at the Virginia Convention
Date: December 2, 1829
“It is sufficiently obvious, that persons and property are the two great subjects on which Governments are to act; and that the rights of persons, and the rights of property, are the objects, for the protection of which Government was instituted. These rights cannot well be separated.”
Albert Gallatin letter to Alexander Addison
Date: October 7, 1789
“The whole of that Bill [of Rights] is a declaration of the right of the people at large or considered as individuals...
t establishes some rights of the individual as unalienable and which consequently, no majority has a right to deprive them of.”
John Adams Thoughts on Government
Date: 1776
“Government is instituted for the common good; for the protection, safety, prosperity, and happiness of the people; and not for profit, honor, or private interest of any one man, family, or class of men; therefore, the people alone have an incontestable, unalienable, and indefeasible right to institute government; and to reform, alter, or totally change the same, when their protection, safety, prosperity, and happiness require it.”
William Paterson: Vanhorne's Lessee v. Dorrance
Date: 1795
“It is evident that the right of acquiring and possessing property, and having it protected, is one of the natural, inherent, and unalienable rights of man. Men have a sense of property: Property is necessary to their subsistence, and correspondent to their natural wants and desires; its security was one of the objects, that induced them to unite in society. No man would become a member of a community, in which he could not enjoy the fruits of his honest labour and industry.”
Alexander Hamilton The Farmer Refuted
Date: February 23, 1775
“The fundamental source of all your errors, sophisms and false reasonings is a total ignorance of the natural rights of mankind. Were you once to become acquainted with these, you could never entertain a thought, that all men are not, by nature, entitled to a parity of privileges. You would be convinced, that natural liberty is a gift of the beneficent Creator to the whole human race, and that civil liberty is founded in that; and cannot be wrested from any people, without the most manifest violation of justice.”
George Washington letter to the Hebrew Congregation of Newport, Rhode Island
Date: August 17, 1790
“It is now no more that toleration is spoken of as if it were the indulgence of one class of people that another enjoyed the exercise of their inherent natural rights, for happily, the Government of the United States, which gives to bigotry no sanction, to persecution no assistance, requires only that they who live under its protection should demean themselves as good citizens in giving it on all occasions their effectual support.”
James Wilson Lectures on Law
Date: 1791
“Government, in my humble opinion, should be formed to secure and to enlarge the exercise of the natural rights of its members; and every government, which has not this in view, as its principal object, is not a government of the legitimate kind.”
Jefferson's line "Life, liberty, and the pursuit of happiness" as examples of unalienable rights was almost certainly adapated from the Blackstone Law Commentaries which every educated citizen was acquainted in revolutionary times and which continues to this day to be present in every comprehensive law library in the land.