“If our free society is to endure, and I know it will, those who govern must recognize that the Framers of the Constitution limited their power in order to preserve human dignity and the air of freedom which is our proudest heritage.”

Presidency (1977–1981), Inaugural Address (1977)
Context: We have already found a high degree of personal liberty, and we are now struggling to enhance equality of opportunity. Our commitment to human rights must be absolute, our laws fair, our natural beauty preserved; the powerful must not persecute the weak, and human dignity must be enhanced.

1870s, Message to the Senate and House of Representatives (1870)
Context: The framers of our Constitution firmly believed that a republican government could not endure without intelligence and education generally diffused among the people. The Father of his Country, in his Farewell Address, uses this language: Promote, then, as an object of primary importance, institutions for the general diffusion of knowledge. In proportion as the structure of a government gives force to public opinion, it is essential that public opinion should be enlightened.

Source: Propaganda (1928), p. 37 <!-- the first two sentences are very widely cited -->
Context: The conscious and intelligent manipulation of the organized habits and opinions of the masses is an important element in democratic society. Those who manipulate this unseen mechanism of society constitute an invisible government which is the true ruling power of our country. We are governed, our minds are molded, our tastes formed, our ideas suggested, largely by men we have never heard of. This is a logical result of the way in which our democratic society is organized. Vast numbers of human beings must cooperate in this manner if they are to live together as a smoothly functioning society.

2000s, Before In History (2004)

Address By Dr. Shanker Dayal Sharma President Of India On The Occasion Of The 50th Anniversary Of The First Sitting Of The Constituent Assembly

1960s, Family Planning - A Special and Urgent Concern (1966)

King v. Hunt (1824), 2 St. Tr. (N. S.) 100.

Introduction
Capitalism and Freedom (1962)
Context: The free man will ask neither what his country can do for him nor what he can do for his country. He will ask rather "What can I and my compatriots do through government" to help us discharge our individual responsibilities, to achieve our several goals and purposes, and above all, to protect our freedom? And he will accompany this question with another: How can we keep the government we create from becoming a Frankenstein that will destroy the very freedom we establish it to protect? Freedom is a rare and delicate plant. Our minds tell us, and history confirms, that the great threat to freedom is the concentration of power. Government is necessary to preserve our freedom, it is an instrument through which we can exercise our freedom; yet by concentrating power in political hands, it is also a threat to freedom. Even though the men who wield this power initially be of good will and even though they be not corrupted by the power they exercise, the power will both attract and form men of a different stamp.

2010s, Open letter to Khizr M. Khan (31 July 2016)