evidently distinct.  It is one thing to know virtue, and another to conform the will to it.  In order, therefore, to prove, that the measures of right and wrong are eternal laws, obligatory on every rational mind, it is not sufficient to shew the relations upon which they are founded:  We must also point out the connexion betwixt the relation and the will; and must prove that this connexion is so necessary, that in every well-disposed mind, it must take place and have its influence; though the difference betwixt these minds be in other respects immense and infinite.  Now besides what I have already proved, that even in human nature no relation can ever alone produce any action:  besides this, I say, it has been shewn, in treating of the understanding, that there is no connexion of cause and effect, such as this is supposed to be, which is discoverable otherwise than by experience, and of which we can pretend to have any security by the simple consideration of the objects.  All beings in the universe, considered in themselves, appear entirely loose and independent of each other.  It is only by experience we learn their influence and connexion; and this influence we ought never to extend beyond experience.

Thus it will be impossible to fulfil the first condition required to the system of eternal measures of right and wrong; because it is impossible to shew those relations, upon which such a distinction may be founded:  And it is as impossible to fulfil the second condition; because we cannot prove A priori, that these relations, if they really existed and were perceived, would be universally forcible and obligatory.

But to make these general reflections more dear and convincing, we may illustrate them by some particular instances, wherein this character of moral good or evil is the most universally acknowledged.  Of all crimes that human creatures are capable of committing, the most horrid and unnatural is ingratitude, especially when it is committed against parents, and appears in the more flagrant instances of wounds and death.  This is acknowledged by all mankind, philosophers as well as the people; the question only arises among philosophers, whether the guilt or moral deformity of this action be discovered by demonstrative reasoning, or be felt by an internal sense, and by means of some sentiment, which the reflecting on such an action naturally occasions.  This question will soon be decided against the former opinion, if we can shew the same relations in other objects, without the notion of any guilt or iniquity attending them.  Reason or science is nothing but the comparing of ideas, and the discovery of their relations; and if the same relations have different characters, it must evidently follow, that those characters are not discovered merely by reason.  To put the affair, therefore, to this trial, let us chuse any inanimate object, such as an oak or elm; and let us suppose, that by the dropping of its seed, it produces a sapling below it, which