My good reader, whoever you are, I have little expectation that you will be very propitious to this my undertaking, from a supposition, that you probably are already preoccupied in favour of many of the opinions which I combat; and I ought not to have such confidence, either in my persuasive powers, or in your docility, as to promise myself an early conquest of your prejudices, or a sudden attachment of your approbation. From hence it may follow, that stiff in your old opinions, you will condemn my sentiments, as false and injurious. Father Malebranche said justly, that those authors who write with an intention to banish common pre-possessions, should always conclude, that the public will receive their works with disgust. Whenever it happens that truth becomes triumphant, the victory advances by such slow paces, that the author while he lives, only enjoys the vain expectation, that his tomb will one day be crown’d with laurels. A striking example of this truth, was seen in the famous William Hervey, against whom, on account of his noble discovery respecting the circulation of the blood, the physicians of that time declaimed furiously, though all the professors of the science at present, venerate him as an oracle. In his life-time they loaded him with injuries; now he is dead they would place his image on the altars. I should here endeavour to win your mind to an admission of my maxims, and take the opportunity of shewing by various examples, how involv’d in error, are many of the most established opinions; but this being the intire object of my first discourse, I must refer you thither, for the perusal of my arguments on this head, I having plac’d that discourse in the front, as a necessary preliminary to this volume; but if you are not to be persuaded, and are obstinately bent on remaining a constant partizan of the Voice of the People, in the name of goodness pursue your course. If you are wise, I shall treat you liberally, and we shall not become angry with each other; for liberality will reprehend the sentiment, without ill using the author; but if you are simple, you, together with that infirmity, will not fail to possess the quality of inexorable also. I know very well, there is not a more rigid censurer of a book, than a man who is incapable of dictating a letter. Such people may say what they please of me, and treat my opinions as excentric, because they are out of the common road; but let us agree in a preliminary, to wit, that if they are to take the liberty of calling me extravagant, I may be allowed to say they are ignorant.