Most of the arts and professions in a state are of such a nature, that, while they promote the interest of the society, they are also useful or agreeable to some individuals; and in that case, the constant rule of the magistrate, except, perhaps, on the first introduction of any art, is, to leave the profession to itself, and trust its encouragement to those who reap the benefit of it. The artizans, finding their profits to rise by the favour of their customers, encrease, as much as possible, their skill and industry; and as matters are not disturbed by any injudicious tampering, the commodity is always sure to be at all times nearly proportioned to the demand.
But there are also some callings, which, though useful and even necessary in a state, bring no particular advantage or pleasure to any individual; and the supreme power is obliged to alter its conduct with regard to the retainers of those professions. It must give them public encouragement in order to their subsistence; and it must provide against that negligence, to which they will naturally be subject, either by annexing peculiar honours to the profession, by establishing a long subordination of ranks and a strict dependance, or by some other expedient. The persons, employed in the finances, armies, fleets, and magistracy, are instances of this order of men.
It may naturally be thought, at first sight, that the ecclesiastics belong to the first class, and that their encouragement, as well as that of lawyers and physicians, may safely be entrusted to the liberality of individuals, who are attached to their doctrines, and who find benefit or consolation from their spiritual ministry and assistance. Their industry and vigilance will, no doubt, be whetted by such an additional motive; and their skill in the profession, as well as their address in governing the minds of the people, must receive daily encrease, from their encreasing practice, study, and attention.
But if we consider the matter more closely, we shall find, that this interested diligence of the clergy is what every wise legislator will study to prevent; because in every religion, except the true, it is highly pernicious, and it has even a natural tendency to pervert the true, by infusing into it a strong mixture of superstition, folly, and delusion. Each ghostly practitioner, in order to render himself more precious and sacred in the eyes of his retainers, will inspire them with the most violent abhorrence of all other sects, and continually endeavour, by some novelty, to excite the languid devotion of his audience. No regard will be paid to truth, morals, or decency in the doctrines inculcated. Every tenet will be adopted that best suits the disorderly affections of the human frame. Customers will be drawn to each conventicle by new industry and address in practising on the passions and credulity of the populace. And in the end, the civil magistrate will find, that he has dearly paid for his pretended frugality, in saving a fixed establishment for the priests; and that in reality the most decent and advantageous composition, which he can make with the spiritual guides, is to bribe their indolence, by assigning stated salaries to their profession, and rendering it superfluous for them to be farther active, than merely to prevent their flock from straying in quest of new pastures. And in this manner ecclesiastical establishments, though commonly they arose at first from religious views, prove in the end advantageous to the political interests of society.
But we may observe, that few ecclesiastical establishments have been fixed upon a worse foundation than that of the church of Rome, or have been attended with circumstances more hurtful to the peace and happiness of mankind. [Hume then describes how the establishment of the Catholic Church went bad in the 15th century, and how, in his view, this helped start the Reformation. The answer turns out to be "not much". T.]