John Stuart Mill’s On Liberty turns 150 this year. Published in 1859, this slender manifesto for human liberty went on to become a classic of modern philosophy and political science.  It remains a beautiful articulation of the core principles of human liberty and a just society.

Anyone familiar with the book recognizes the importance of the opening chapter and Mill’s “one very simple principle” for “the dealings of society with the individual in the way of compulsion and control, whether the means used be physical force in the form of legal penalties, or the moral coercion of public opinion”:

That principle is, that the sole end for which mankind are warranted, individually or collectively, in interfering with the liberty of action of any of their number, is self-protection. That the only purpose for which power can be rightfully exercised over any member of a civilized community, against his will, is to prevent harm to others. His own good, either physical or moral, is not a sufficient warrant. He cannot rightfully be compelled to do or forbear because it will be better for him to do so, because it will make him happier, because, in the opinions of others, to do so would be wise, or even right. These are good reasons for remonstrating with him, or reasoning with him, or persuading him, or entreating him, but not for compelling him, or visiting him with any evil in case he do otherwise. To justify that, the conduct from which it is desired to deter him, must be calculated to produce evil to some one else. The only part of the conduct of any one, for which he is amenable to society, is that which concerns others. In the part which merely concerns himself, his independence is, of right, absolute. Over himself, over his own body and mind, the individual is sovereign.

Mill went on to outline “the appropriate region of human liberty,” and divided it into:

1. “liberty of conscience, in the most comprehensive sense; liberty of thought and feeling; absolute freedom of opinion and sentiment on all subjects, practical or speculative, scientific, moral, or theological. The liberty of expressing and publishing opinions may seem to fall under a different principle, since it belongs to that part of the conduct of an individual which concerns other people; but, being almost of as much importance as the liberty of thought itself, and resting in great part on the same reasons, is practically inseparable from it.”
2. “liberty of tastes and pursuits; of framing the plan of our life to suit our own character; of doing as we like, subject to such consequences as may follow: without impediment from our fellow-creatures, so long as what we do does not harm them, even though they should think our conduct foolish, perverse, or wrong”
3. “freedom to unite, for any purpose not involving harm to others”

Bringing it altogether, he argued:

The only freedom which deserves the name, is that of pursuing our own good in our own way, so long as we do not attempt to deprive others of theirs, or impede their efforts to obtain it. Each is the proper guardian of his own health, whether bodily, or mental and spiritual. Mankind are greater gainers by suffering each other to live as seems good to themselves, than by compelling each to live as seems good to the rest.

To this day, I do not believe there has been a more eloquent or concise summation of the central principles of libertarianism than those passages from Chapter 1 of the book. But what many fail to remember or appreciate is the equally powerful second chapter of Mill’s treatise, “On the Liberty of Thought and Discussion.” It was a bold defense of freedom of speech and expression that was many decades ahead of its time. And it still has lessons and warnings worth heeding in our modern Information Age.

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