We will often find that people with great humanity but lack self-control in the world will be lazy, hesitant and prone to depression when they encounter difficulties and dangers in the pursuit of the highest honor; On the contrary, we often find that people who can control themselves perfectly will not be intimidated by any difficulties or any dangers, but at the same time, they seem indifferent to all feelings about justice or humanity.

We can't get dinner through the kindness of butchers, brewers or bakers, but because they value their own interests.

The tendency of exchange is driven by its own interests, leading to division of labor.

Wealth is the right to exchange labor.

Never beg for mercy from others, but appeal to your own interests; Never talk to others about your own needs, just talk about their benefits.

Division of labor is the main reason for the improvement of labor productivity.

Everyone is constantly trying to find the most favorable use for the capital at his disposal. Of course, he is considering his own interests. However, his concern for his own interests will naturally, or inevitably, bias him towards the most beneficial use for society. It's like "an invisible hand" is guiding him to do his best to achieve a goal he doesn't want to achieve.

Poverty will undoubtedly make people unwilling to get married, but it will not necessarily make people not get married.

If the fruits of a society's development can't completely flow to the public, then it is morally unpopular and risky, because it is bound to threaten social stability.