The evil here pointed out is not one which exists only in theory; and it may perhaps be expected that I should specify the instances in which the public of this age and country improperly invests its own preferences with the character of moral laws. I am not writing an essay on the aberrations of existing moral feeling. That is too weighty a subject to be discussed parenthetically, and by way of illustration. Yet examples are necessary, to show that the principle I maintain is of serious and practical moment, and that I am not endeavouring to erect a barrier against imaginary evils. And it is not difficult to show, by abundant instances, that to extend the bounds of what may be called moral police, until it encroaches on the most unquestionably legitimate liberty of the individual, is one of the most universal of all human propensities.