I cannot forbear adding to these reasonings an observation, which may, perhaps, be found of some importance. In every system of morality which I have hitherto met with, I have always remarked, that the author proceeds for some time in the ordinary way of reasoning, and establishes the being of a God, or makes observations concerning human affairs; when of a sudden I am surprised to find, that instead of the usual copulations of propositions, _is_, and _is not_, I meet with no proposition that is not connected with an _ought_, or an _ought not_. This change is imperceptible; but is, however, of the last consequence. For as this _ought_, or _ought not_, expresses some new relation or affirmation, 'tis necessary that it should be observed and explained; and at the same time that a reason should be given, for what seems altogether inconceivable, how this new relation can be a deduction from others, which are entirely different from it. But as authors do not commonly use this precaution, I shall presume to recommend it to the readers; and am persuaded, that this small attention would subvert all the vulgar systems of morality, and let us see, that the distinction of vice and virtue is not founded merely on the relations of objects, nor is perceived by reason. [1] Book II. Part III. Sect. 3 [2] One might think it were entirely superfluous to prove this, if a late author, who has had the good fortune to obtain some reputation, had not seriously affirmed, that such a falsehood is the foundation of all guilt and moral deformity. That we may discover the fallacy of his hypothesis, we need only consider, that a false conclusion is drawn from an action, only by means of an obscurity of natural principles, which makes a cause be secretly interrupted in its operation, by contrary causes, and renders the connexion betwixt two objects uncertain and variable. Now, as a like uncertainty and variety of causes take place, even in natural objects, and produce a like error in our judgment, if that tendency to produce error were the very essence of vice and immorality, it should follow, that even inanimate objects might be vicious and immoral. 'Tis in vain to urge, that inanimate objects act without liberty and choice. For as liberty and choice are not necessary to make an action produce in us an erroneous conclusion, they can be, in no respect, essential to morality; and I do not readily perceive, upon this system, how they can ever come to be regarded by it. If the tendency to cause error be the origin of immorality, that tendency and immorality would in every case be inseparable. Add to this, that if I had used the precaution of shutting the windows, while I indulged myself in those liberties with my neighbour's wife, I should have been guilty of no immorality; and that because my action, being perfectly concealed, would have had no tendency to produce any false conclusion.