“My conception of freedom is no narrow conception. It is co-extensive with the freedom of man in all his majesty.”

Source: The Science of Rights 1796, P. 173-175

Source: "The Failure of Nonviolence" (2013) https://theanarchistlibrary.org/library/peter-gelderloos-the-failure-of-nonviolence, Chapter 1. Violence Doesn't Exist

Discours de réception de Louis Pasteur (1882)
Original: Où sont les vraies sources de la dignité humaine, de la liberté et de la démocratie moderne, sinon dans la notion de l’infini devant laquelle tous les hommes sont égaux?

Source: The Science of Rights 1796, P. 23-24

Source: 1930s- 1950s, The End of Economic Man (1939), p. 50

Source: Life, the Truth, and Being Free (2010), p. 73

Source: The Russian Revolution (1918), Chapter Six, "The Problem of Dictatorship"

Introduction, Beast and Man: The Roots of Human Nature (1979).
Context: The notion that we "have a nature" far from threatening the concept of freedom, is absolutely essential to it. If we were genuinely plastic and indeterminate at birth, there could be no reason why society should not stamp us into any shape that might suit it. The reason people view suggestions about inborn tendencies with such indiscriminate horror seems to be that they think exclusively in one particular way in which the idea of such tendencies has been misused, namely, that where conservative theorists invoke them uncritically to resist reform. But liberal theorists who combat such resistance need them just as much, and indeed, usually more. The early architects of our current notion of freedom made human nature their cornerstone. Rousseau's trumpet call "Man is born free, but everywhere he is in chains," makes sense only as description of our innate constitution as something positive, already determined, and conflicting with what society does to us. Kant and Mill took similar positions. And Marx, though he officially dropped the notion of human nature and attacked the term, relied on the idea as much as anybody else for his crucial notion of Dehumanization.

Variant translation: Liberal institutions straightway cease from being liberal the moment they are soundly established: once this is attained no more grievous and more thorough enemies of freedom exist than liberal institutions.
Expeditions of an Untimely Man, 38
Twilight of the Idols (1888)
Context: My conception of freedom. — The value of a thing sometimes does not lie in that which one attains by it, but in what one pays for it — what it costs us. I give an example. Liberal institutions cease to be liberal as soon as they are attained: later on, there are no worse and no more thorough injurers of freedom than liberal institutions. One knows, indeed, what their ways bring: they undermine the will to power; they level mountain and valley, and call that morality; they make men small, cowardly, and hedonistic [genüsslich] — every time it is the herd animal that triumphs with them. Liberalism: in other words, herd-animalization...