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is nothing I wou'd more willingly lay hold of, than an opportunity of confessing my errors; and shou'd esteem such a return to truth and reason to be more honourable than the most unerring judgment. A man, who is free from mistakes, can pretend to no praises, except from the justness of his understanding: But a man, who corrects his mistakes, shews at once the justness of his understanding, and the candour and ingenuity of his temper. I have not yet been so fortunate as to discover any very considerable mistakes in the reasonings deliver'd in the preceding volumes, except on one article: But I have found by experience, that some of my expressions have not been so well chosen, as to guard against all mistakes in the readers; and 'tis chiefly to remedy this defect, I have subjoin'd the following appendix.

We can never be induc'd to believe any matter of fact, except where its cause, or its effect, is present to us; but what the nature is of that belief, which arises from the relation of cause and effect, few have had the curiosity to ask themselves. In my opinion, this dilemma is inevitable. Either the belief is some new idea, such as that of reality or existance, which we join to the simple conception of an object, or it is merely a peculiar feeling or sentiment. That it is not a new idea, annex'd to the simple conception, may be evinc'd from these two arguments. First, We have no abstract idea of existence, distinguishable and separable from the idea of particular objects. 'Tis impossible, therefore, that this idea of existence can be annex'd to the idea. of any object, or form the difference betwixt a simple conception and belie£ Secondly, The mind has the command over all its ideas, and