Despite his relative literary success with accounts of his European travels, Boswell was only a moderately successful advocate, with the exception of the copyright infringement case of "Donaldson v Beckett", where Boswell represented the Scottish bookseller Alexander Donaldson. By the late 1770s, Boswell descended further and further into alcoholism and gambling addiction. Throughout his life, from childhood until death, he was beset by severe swings of mood. His depressions frequently encouraged and were exacerbated by his various vices. His happier periods usually saw him relatively vice-free. His character mixed a superficial Enlightenment sensibility for reason and taste with a genuine and somewhat romantic love of the sublime and a propensity for occasionally puerile whimsy. The latter, along with his tendency for drink and other vices, caused many contemporaries and later observers to regard him as being too lightweight to be an equal in the literary crowd that he wanted to be a part of. However, his humour and innocent good nature won him many lifelong friends.