Between 1749 and 1751, Hume resided at Ninewells, with his brother and sister, and busied himself with the composition of his most finished, if not his most important works, the Dialogues on Natural Religion, the Inquiry Concerning the Principles of Morals, and the Political Discourses.
The Dialogues on Natural Religion were touched and re-touched, at intervals, for a quarter of a century, and were not published till after Hume's death: but the Inquiry Concerning the Principles of Morals appeared in 1751, and the Political Discourses in 1752. Full reference will be made to the two former in the exposition of Hume's philosophical views. The last has been well said to be the "cradle of political economy: and much as that science has been investigated and expounded in later times, these earliest, shortest, and simplest developments of its principles are still read with delight even by those who are masters of all the literature of this great subject."[9]
The Wealth of Nations, the masterpiece of Hume's close friend, Adam Smith, it must be remembered, did not appear before 1776, so that, in political economy, no less than in philosophy, Hume was an original, a daring, and a fertile innovator.
The Political Essays had a great and rapid success; translated into French in 1753, and again in 1754, they conferred a European reputation upon their author; and, what was more to the purpose, influenced the later French school of economists of the eighteenth century.
By this time, Hume had not only attained a high reputation in the world of letters, but he considered himself a man of independent fortune. His frugal habits had enabled him to accumulate £1,000, and he tells Michael Ramsay in 1751:—
"While interest remains as at present, I have £50 a year, a hundred pounds worth of books, great store of linens and fine clothes, and near £100 in my pocket; along with order, frugality, a strong spirit of independency, good health, a contented humour, and an unabated love of study. In these circumstances I must esteem myself one of the happy and fortunate; and so far from being willing to draw my ticket over again in the lottery of life, there are very few prizes with which I would make an exchange. After some deliberation, I am resolved to settle in Edinburgh, and hope I shall be able with these revenues to say with Horace:—
'Est bona librorum et provisæ frugis in annum
Copia.'"
It would be difficult to find a better example of the honourable independence and cheerful self-reliance which should distinguish a man of letters, and which characterised Hume throughout his career. By honourable effort, the boy's noble ideal of life, became the man's reality; and, at forty, Hume had the happiness of finding that he had not wasted his youth in the pursuit of illusions, but that "the solid certainty of waking bliss" lay before him, in the free play of his powers in their appropriate sphere.
In 1751, Hume removed to Edinburgh and took up his abode on a flat in one of those prodigious houses in the Lawnmarket, which still excite the admiration of tourists; afterwards moving to a house in the Canongate. His sister joined him, adding £30 a year to the common stock; and, in one of his charmingly playful letters to Dr. Clephane, he thus describes his establishment, in 1753.
"I shall exult and triumph to you a little that I have now at last—being turned of forty, to my own honour, to that of learning, and to that of the present age—arrived at the dignity of being a householder.
"About seven months ago, I got a house of my own, and completed a regular family, consisting of a head, viz., myself, and two inferior members, a maid and a cat. My sister has since joined me, and keeps me company. With frugality, I can reach, I find, cleanliness, warmth, light, plenty, and contentment. What would you have more? Independence? I have it in a supreme degree. Honour? That is not altogether wanting. Grace? That will come in time. A wife? That is none of the indispensable requisites of life. Books? That is one of them; and I have more than I can use. In short, I cannot find any pleasure of consequence which I am not possessed of in a greater or less degree; and, without any great effort of philosophy, I may be easy and satisfied.
"As there is no happiness without occupation, I have begun a work which will occupy me several years, and which yields me much satisfaction. 'Tis a History of Britain from the Union of the Crowns to the present time. I have already finished the reign of King James. My friends flatter me (by this I mean that they don't flatter me) that I have succeeded."
In 1752, the Faculty of Advocates elected Hume their librarian, an office which, though it yielded little emolument—the salary was only forty pounds a year—was valuable as it placed the resources of a large library at his disposal. The proposal to give Hume even this paltry place caused a great outcry, on the old score of infidelity. But as Hume writes, in a jubilant letter to Clephane (February 4, 1752):—