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N° 154. of ideas, in which the philosopher to whom they happened had no other merit than that of knowing their value, and transmitting unclouded, to posterity, that light which had been kindled by causes out of his power. The happiness of these casual illuminations, no man can promise to himself, because no endeavours can procure them; and therefore, whatever be our abilities or application, we must submit to learn from others, what,  perhaps, would have lain hid for ever from human penetration, had not some remote enquiry brought it to view; as treasures are thrown up by the ploughman and the digger in the rude exercise of their common occupations.

The man whose genius qualifies him for great undertakings, must at least be content to learn from books the present state of human knowledge; that he may not ascribe to himself the invention of arts generally known; weary his attention with experiments of which the event has been long registered; and waste, in attempts which have already succeeded or miscarried, that time which might have been spent with usefulness and honour upon new undertakings.

But, though the study of books is necessary, it is not sufficient to constitute literary eminence. He that wishes to be counted among the benefactors of posterity, must add by his own toil to the acquisitions of his ancestors, and secure his memory from neglect, by some valuable improvement. This can only be effected by looking out upon the wastes of the intellectual world, and extending the power of learning over regions yet undisciplined and barbarous; or by surveying more exactly our ancient dominions, and driving ignorance from the fortresses and retreats, where she skulks undetected and