The Wealth of Nations by Part 5 Chapter 1 Page 265

every branch either of useful or ornamental knowledge of which they may have laid the foundation, or for which they may have acquired some taste in the earlier part of life.

It is otherwise with the common people. They have little time to spare for education. Their parents can scarce afford to maintain them even in infancy. As soon as they are able to work they must apply to some trade by which they can earn their subsistence. That trade, too, is generally so simple and uniform as to give little exercise to the understanding, while, at the same time, their labour is both so constant and so severe, that it leaves them little leisure and less inclination to apply to, or even to think of, anything else.

But though the common people cannot, in any civilised society, be so well instructed as