“Independence is happiness.”

2000s, Interview with Peter Robinson (2009)

"Summary of Principles" 1.3
Enquiry Concerning Political Justice (1793)

https://twitter.com/chrisrock/status/220512157937315842
Twitter
2012-07-04, quoted in Chris Rock Lights Up Controversy With Fourth of July Tweet, 2012-07-06, ABC News http://abcnews.go.com/blogs/entertainment/2012/07/chris-rock-fires-up-controversy-with-fourth-of-july-tweet/,
Miscellaneous

Letter to Richard Price (22 March 1778) regarding Price's pamphlet, Observations on Civil Liberty and the Justice and Policy of the War with America (1776).
Context: The fate of America is already decided — Behold her independent beyond recovery. — But will She be free and happy? — Can this new people, so advantageously placed for giving an example to the world of a constitution under which man may enjoy his rights, freely exercise all his faculties, and be governed only by nature, reason and justice — Can they form such a Constitution? — Can they establish it upon a never failing foundation, and guard against every source of division and corruption which may gradually undermine and destroy it? … It is impossible not to wish ardently that this people may attain to all the prosperity of which they are capable. They are the hope of the world. They may become a model to it. They may prove by fact that men can be free and yet tranquil; and that it is in their power to rescue themselves from the chains in which tyrants and knaves of all descriptions have presumed to bind them under the pretence of the public good. They may exhibit an example of political liberty, of religious liberty, of commercial liberty, and of industry. The Asylum they open to the oppressed of all nations should console the earth. The case with which the injured may escape from oppressive governments, will compel Princes to become just and cautious; and the rest of the world will gradually open their eyes upon the empty illusions with which they have been hitherto cheated by politicians. But for this purpose America must preserve herself from these illusions; and take care to avoid being what your ministerial writers are frequently saying She will be — an image of our Europe — a mass of divided powers contending for territory and commerce, and continually cementing the slavery of the people with their own blood.

To Scotland, with Love. p. 124.
The Light's On At Signpost (2002)

So gewiß ist der allein glücklich und groß, der weder zu herrschen noch zu gehorchen braucht, um etwas zu sein!
Alternative translation: So certain is it that he alone is great and happy, who requires neither to command nor to obey, in order to secure his being of some importance in the world.
Götz von Berlichingen, Act I (1773), p. 39
Source: Goethe’s Works, vol. 3, Götz Von Berlichingen (With the Iron Hand) http://oll.libertyfund.org/index.php?option=com_staticxt&staticfile=show.php%3Ftitle=2113&layout=html#chapter_164458
Source: Beautiful thoughts from German and Spanish authors, by C. T. Ramage (1868) https://archive.org/stream/beautifulthough00unkngoog#page/n112/mode/2up

As quoted in Russia and the Independent States (1993) by Daniel C. Diller, p. 446
1990s
Context: Liberty sets the mind free, fosters independence and unorthodox thinking and ideas. But it does not offer instant prosperity or happiness and wealth to everyone. This is something that politicians in particular must keep in mind.

Part 2.7 Chapter V. Ways and means of improving the condition of Europe, interspersed with miscellaneous observations
Source: 1790s, Rights of Man, Part 2 (1792)
Context: I speak an open and disinterested language, dictated by no passion but that of humanity. To me, who have not only refused offers, because I thought them improper, but have declined rewards I might with reputation have accepted, it is no wonder that meanness and imposition appear disgustful. Independence is my happiness, and I view things as they are, without regard to place or person; my country is the world, and my religion is to do good.