We are unable to say any thing more certain concerning the person to whom our author has addressed his work. It appears, however, from many circumstances in these Letters, that she was not a supposititious marchioness, like her of the _Worlds_ of M. de Fontenelle, and that they have really been written to a woman as distinguished by her rank as by her manners. Perhaps she was a lady of the school of the Temple, or of Seaux. But these details, in reality, as well as those which concern the name and the life of our author, the date of his birth, that of his death, &c., are of little importance, and could only serve to satisfy the vain curiosity of some idle readers, who avidiously collect these kind of anecdotes, who receive from them a kind of existence in the world, and who feel more satisfaction from being instructed in them than from the discovery of a truth. I know that they endeavor to justify their curiosity by saying that when a person reads a book which creates a public sensation, and with which he is himself much pleased, it is natural he should desire to know to whom a grateful homage should be addressed. In this case the desire is so much the more unreasonable because it cannot be satisfied; first, because when death and proscription is the penalty, there has never been and there never will be a man of letters so imprudent, and, to speak plainly, so strangely daring, as to publish, or during his life to allow a book to be printed, in which he tramples under foot temples, altars, and the statues of the gods, and where he attacks without any disguise the most consecrated religious opinions; secondly, because it is a matter of public notoriety that all the works of this character which have appeared for many years are the secret testaments of numbers of great men, obliged during their lives to conceal their light under a bushel, whose heads death has withdrawn from the fury of persecutors, and whose cold ashes, consequently, do not hear in the tomb either the importunate and denunciatory cries of the superstitious, or the just eulogiums of the friends of truth; thirdly and lastly, _because this curiosity, so unfortunately entertained, may compromise in the most cruel manner the repose, the fortune, and the liberty of the relatives and friends of the authors of these bold books!_ This single consideration ought, then, to determine those hazarders of conjectures, if they have really good intentions, to wrap in the inmost folds of their hearts whatever suspicions they may entertain concerning the author, however true or false they may be, and to turn their inquiring spirits to a use more beneficial for both themselves and others. TRANSLATOR'S PREFACE.