"It is not from the benevolence of the butcher, the brewer or the baker that we expect our dinner". Please explain

“It is not from the benevolence of the butcher, the brewer or the baker that we expect our dinner”
“It is not from the benevolence of the butcher, the brewer, or the baker that we expect our dinner, but from their regard to their own self-interest. We address ourselves not to their humanity but to their self-love, and never talk to them of our own necessities, but of their advantages”
― Adam Smith, “ An Inquiry into the Nature and Causes of the Wealth of Nations”.
This famous line , written and explained by the Scottish Economists, Adam Smith in his famous book, “ An Inquiry into the Nature and Causes of the Wealth of Nations” which was published in 1776. Adam Smith wrote this fundamental book on how free markets work. The Wealth of Nations offered a number of important ideas about what makes an economy work, including the crucial role that human self-interest plays. Smith is saying that...