The Wealth of Nations by Part 1 Chapter 10 Page 71

The institution of long apprenticeships has no tendency to form a young people to industry. A journeyman who works by the piece is likely to be industrious, because he derives a benefit from every exertion of his industry. An apprentice is likely to be idle, and almost always is so, because he has no immediate interest to be otherwise. In the inferior employments, the sweets of labour consist altogether in the recompense of labour. They who are soonest in a condition to enjoy the sweets of it are likely soonest to conceive a relish for it, and to acquire the early habit of industry.

A young man naturally conceives an aversion to labour when for a long time he receives no benefit from it. The boys who are put out apprentices from public charities are generally bound for more than the usual number of years, and they generally turn out very idle and worthless.