sentences:  He began to express such ideas in "The Stones of Venice", and increasingly in works of the later 1850s, such as "The Political Economy of Art" ("A Joy for Ever"), but he gave them full expression in the influential essays, "Unto This Last".At the root of his theory, was Ruskin's dissatisfaction with the role and position of the worker, and especially the artisan or craftsman, in modern industrial capitalist society.Ruskin believed that the economic theories of Adam Smith, expressed in "The Wealth of Nations" had led, through the division of labour to the alienation of the worker not merely from the process of work itself, but from his fellow workmen and other classes, causing increasing resentment.