Six years longer Hume remained at Ninewells before he made another attempt to embark in a practical career--this time commerce--and with a like result. For a few months' trial proved that kind of life, also, to be hopelessly against the grain. It was while in London, on his way to Bristol, where he proposed to commence his mercantile life, that Hume addressed to some eminent London physician (probably, as Mr. Burton suggests, Dr. George Cheyne) a remarkable letter. Whether it was ever sent seems doubtful; but it shows that philosophers as well as poets have their Werterian crises, and it presents an interesting parallel to John Stuart Mill's record of the corresponding period of his youth. The letter is too long to be given in full, but a few quotations may suffice to indicate its importance to those who desire to comprehend the man. "You must know then that from my earliest infancy I found always a strong inclination to books and letters. As our college education in Scotland, extending little further than the languages, ends commonly when we are about fourteen or fifteen years of age, I was after that left to my own choice in my reading, and found it incline me almost equally to books of reasoning and philosophy, and to poetry and the polite authors. Every one who is acquainted either with the philosophers or critics, knows that there is nothing yet established in either of these two sciences, and that they contain little more than endless disputes, even in the most fundamental articles. Upon examination of these, I found a certain boldness of temper growing on me, which was not inclined to submit to any authority in these subjects, but led me to seek out some new medium, by which truth might be established. After much study and reflection on this, at last, when I was about eighteen years of age, there seemed to be opened up to me a new scene of thought, which transported me beyond measure, and made me, with an ardour natural to young men, throw up every other pleasure or business to apply entirely to it. The law, which was the business I designed to follow, appeared nauseous to me, and I could think of no other way of pushing my fortune in the world, but that of a scholar and philosopher. I was infinitely happy in this course of life for some months; till at last, about the beginning of September, 1729, all my ardour seemed in a moment to be extinguished, and I could no longer raise my mind to that pitch, which formerly gave me such excessive pleasure." This "decline of soul" Hume attributes, in part, to his being smitten with the beautiful representations of virtue in the works of Cicero, Seneca, and Plutarch, and being thereby led to discipline his temper and his will along with his reason and understanding.