Political freedom in a citizen is the tranquility of mind that comes from the opinion each one has of his security; and for him to have this freedom, the government must be such that one citizen cannot fear another citizen.

[La liberté politique, dans un citoyen, est cette tranquillité d’esprit qui provient de l’opinion que chacun a de sa sûreté: &, pour qu’on ait cette liberté, il faut que le gouvernement soit tel, qu’un citoyen ne puisse pas craindre un autre citoyen.]

Charles-Lewis de Secondat, Baron de Montesquieu (1689-1755) French political philosopher

Spirit of Laws [The Spirit of the Laws; De l’esprit des lois], Book 11, ch. 6 (1748) [tr. Stewart (2018)]
    (Source)

(Source (French)). Other translations:

The political liberty of the subject is a tranquility of mind, arising from the opinion each person has of his safety. In order to have this liberty, it is requisite the government be so constituted as one man need not be afraid of another.
[tr. Nugent (1750)]

Political liberty in a citizen is that tranquility of spirit which comes from the opinion each one has of his security, and in order for him to have this liberty the government must be such that one citizen cannot fear another citizen.
[tr. Cohler/Miller/Stone (1989)]

French: x4