Smith, on his return, shut himself up in his study in Kirkcaldy for ten years. His friends in vain attempted to draw him from his solitude to Edinburgh: he steadily, we may almost say magnanimously, refused; and at the end of the tenth year, in 1776, he explained the mystery, by the publication of the two quarto volumes of his _Enquiry into the Nature and Causes of the Wealth of Nations_. The work was received with general congratulation; it was regarded as a new science, although it is well-known, as stated in the introduction to the biography, that many others had previously discussed the same subjects. Smith's views, however, were so much more comprehensive, his division so much more distinct, and his remarks so much more practical, that he deserved all the credit of the architect who combines in beauty and utility the beams and pillars which he finds scattered on the ground. And here we advert to the obvious benefit of that patronage which had been extended to this very able man by Townsend. The annuity which had been settled on him as tutor, had enabled Smith to give up the whole of his time, and the whole powers of his mind, during those ten years, to this great work. During nearly twenty years of lecturing, on the other hand, in which his pen was necessarily employed without ceasing, he seems to have published but one work, _The Theory of Moral Sentiment_. That he constantly formed ingenious conceptions, may be easily admitted; but that he wanted either time or inclination to complete them, is evident from the fact, that he never suffered them to appear in print, and that one of his dying directions was, that they should be destroyed by his executors.