Here is a most interesting and profound quote, directly applicable to everyday life:
"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 interest".
-Taken from Adam Smith's The Wealth of Nations, Book I, Chapter 2. To read the whole context, visit this website: http://geolib.com/smith.adam/won1-02.html
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