Wilhelm von Humboldt argued that freedom was the “Grand and Indispensable Condition” for individual flourishing (1792)

The true end of Man, or that which is prescribed by the eternal and immutable dictates of reason, and not suggested by vague and transient desires, is the highest and most harmonious development of his powers to a complete and consistent whole. Freedom is the grand and indispensable condition which the possibility of such a development presupposes; but there is besides another essential,—intimately connected with freedom, it is true,—a variety of situations. Even the most free and self-reliant of men is thwarted and hindered in his development by uniformity of position. But as it is evident, on the one hand, that such a diversity is a constant result of freedom, and on the other, that there is a species of oppression which, without imposing restrictions on man himself, gives a peculiar impress of its own to surrounding circumstances; these two conditions, of freedom and variety of situation, may be regarded, in a certain sense, as one and the same…

I therefore deduce, as the natural inference from what has been argued, that reason cannot desire for man any other condition than that in which each individual not only enjoys the most absolute freedom of developing himself by his own energies, in his perfect individuality, but in which external nature even is left unfashioned by any human agency, but only receives the impress given to it by each individual of himself and his own free will, according to the measure of his wants and instincts, and restricted only by the limits of his powers and his rights.

From this principle it seems to me, that Reason must never yield aught save what is absolutely required to preserve it. It must therefore be the basis of every political system, and must especially constitute the starting-point of the inquiry which at present claims our attention.