Though all that has arrived, by report, of our knowledge of times past should be true, and known by some one person, it would be less than nothing in comparison of what is unknown. And of this same image of the world, which glides away whilst we live upon it, how wretched and limited is the knowledge of the most curious; not only of particular events, which fortune often renders exemplary and of great concern, but of the state of great governments and nations, a hundred more escape us than ever come to our knowledge. We make a mighty business of the invention of artillery and printing, which other men at the other end of the world, in China, had a thousand years ago. Did we but see as much of the world as we do not see, we should perceive, we may well believe, a perpetual multiplication and vicissitude of forms. There is nothing single and rare in respect of nature, but in respect of our knowledge, which is a wretched foundation whereon to ground our rules, and that represents to us a very false image of things. As we nowadays vainly conclude the declension and decrepitude of the world, by the arguments we extract from our own weakness and decay: "Jamque adeo est affecta aetas effoet aque tellus;" ["Our age is feeble, and the earth less fertile." --Lucretius, ii. 1151.] so did he vainly conclude as to its birth and youth, by the vigour he observed in the wits of his time, abounding in novelties and the invention of divers arts: "Verum, ut opinor, habet novitatem summa, recensque Natura est mundi, neque pridem exordia coepit Quare etiam quaedam nunc artes expoliuntur, Nunc etiam augescunt; nunc addita navigiis sunt Multa." ["But, as I am of opinion, the whole of the world is of recent origin, nor had its commencement in remote times; wherefore it is that some arts are still being refined, and some just on the increase; at present many additions are being made to shipping." --Lucretius, v. 331.]