From page 11.
‘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.’
From page 13.
‘This individual vigour, then, and manifold diversity, combine themselves in originality; and hence, that on which the consummate grandeur of our nature ultimately depends,—that towards which every human being must ceaselessly direct his efforts, and on which especially those who design to influence their fellow men must ever keep their eyes, is the Individuality of Power and Development.
Just as this individuality springs naturally from the perfect freedom of action, and the greatest diversity in the agents, it tends immediately to produce them in turn.
Even inanimate nature, which, proceeding in accordance with unchangeable laws, advances by regular grades of progression, appears more individual to the man who has been developed in his individuality.
He transports himself, as it were, into the very centre of nature; and it is true, in the highest sense, that each still perceives the beauty and rich abundance of the outer world, in the exact measure in which he is conscious of their existence in his own soul.’
[Edited for ease of reading]. Mill cited from von Humboldt in Chapter 3 of his book ‘On Liberty’.