linguistic:paraphrasing, information:classification
Philosophy

Philosophers from the earliest times have considered the question of liberty. Roman Emperor Marcus Aurelius (121–180 AD) wrote:

a polity in which there is the same law for all, a polity administered with regard to equal rights and equal freedom of speech, and the idea of a kingly government which respects most of all the freedom of the governed.

According to compatibilist Thomas Hobbes (1588–1679):

a free man is he that in those things which by his strength and wit he is able to do is not hindered to do what he hath the will to do.

John Locke (1632–1704) rejected that definition of liberty. While not specifically mentioning Hobbes, he attacks Sir Robert Filmer who had the same definition. According to Locke:

In the state of nature, liberty consists of being free from any superior power on Earth. People are not under the will or lawmaking authority of others but have only the law of nature for their rule. In political society, liberty consists of being under no other lawmaking power except that established by consent in the commonwealth. People are free from the dominion of any will or legal restraint apart from that enacted by their own constituted lawmaking power according to the trust put in it. Thus, freedom is not as Sir Robert Filmer defines it: 'A liberty for everyone to do what he likes, to live as he pleases, and not to be tied by any laws.' Freedom is constrained by laws in both the state of nature and political society. Freedom of nature is to be under no other restraint but the law of nature. Freedom of people under government is to be under no restraint apart from standing rules to live by that are common to everyone in the society and made by the lawmaking power established in it. Persons have a right or liberty to (1) follow their own will in all things that the law has not prohibited and (2) not be subject to the inconstant, uncertain, unknown, and arbitrary wills of others.

John Stuart Mill, in his 1859 work, On Liberty, was the first to recognize the difference between liberty as the freedom to act and liberty as the absence of coercion.

In his 1958 lecture " Two Concepts of Liberty ", Isaiah Berlin formally framed the differences between two perspectives as the distinction between two opposite concepts of liberty: positive liberty and negative liberty. The latter designates a negative condition in which an individual is protected from tyranny and the arbitrary exercise of authority, while the former refers to the liberty that comes from self-mastery, the freedom from inner compulsions such as weakness and fear.