Destined to cultivate his own nature, or to mend his situation, man finds a continual subject of attention, ingenuity, and labour. Even where he does not propose any personal improvement, his faculties are strengthened by those very exercises in which he seems to forget himself: his reason and his affections are thus profitably engaged in the affairs of society; his invention and his skill are exercised in procuring his accommodations and his food; his particular pursuits are prescribed to him by circumstances of the age, and of the country in which he lives: in one situation, he is occupied with wars and political deliberations; in another, with the care of his interest, of his personal ease, or conveniency. He suits his means to the ends he has in view; and, by multiplying contrivances, proceeds, by degrees, to the perfection of his arts. In every step of his progress, if his skill be increased, his desire must likewise have time to extend: and it would be as vain to suggest a contrivance of which he slighted the use, as it would be to tell him of blessings which he could not command. Ages are generally supposed to have borrowed from those who went before them, and nations to have received their portion of learning or of art from abroad. The Romans are thought to have learned from the Greeks, and the moderns of Europe from both. From a few examples of this sort, we learn to consider every science or art as derived, and admit of nothing original in the practice or manners of any people. The Greek was a copy of the Egyptian, and even the Egyptian was an imitator, though we have lost sight of the model on which he was formed. It is known, that men improve by example and intercourse; but in the case of nations, whose members excite and direct each other, why seek from abroad the origin of arts, of which every society, having the principles in itself, only requires a favourable occasion to bring them to light? When such occasion presents itself to any people, they generally seize it; and while it continues, they improve the inventions to which it gave rise among themselves, or they willingly copy from others: but they never employ their own invention, nor look abroad, for instruction on subjects that do not lie in the way of their common pursuits; they never adopt a refinement of which they have not discovered the use. Inventions, we frequently observe, are accidental; but it is probable, that an accident which escapes the artist in one age, may be seized by one who succeeds him, and who is better apprized of its use. Where circumstances are favourable, and where a people is intent on the objects of any art, every invention is preserved, by being brought into general practice; every model is studied, and every accident is turned to account. If nations actually borrow from their neighbours, they probably borrow only what they are nearly in a condition to have invented themselves.