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 … 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 would be wise or even right … Over himself, over his own body and mind, the individual is sovereign.
– John Stuart Mill, “philosopher to the Founders”
