It is "not out of benevolence that" dentists clean and repair teeth, but "from their regard for their own self-interest".
Adam Smith was a Scottish political economist. He has turned out to be popular by his compelling book The Wealth of Nations in 1776. A significant part of the reasoning behind Smith's work depends on self-intrigue and amplifying return, "The Theory of Moral Sentiments," was a treatise about how human correspondence depends on sympathy. In the book, Smith contended that individuals are self-intrigued yet normally like to help other people.