What is the main purpose of the final sentence in the excerpt from thomas plaine's common sense?

Adjective clauses  begin with words such as that, when, where, who, whom, whose, which, and why. an essential (or restrictive)  adjective clauseprovides information that is necessary for identifying the word it modifies. so for example*** wrong= i the man gave me direction. example right ( i the man who gave me the  direction.

Bc hes mean idk what book this is 

Ithink it should be: hard work gives a person a sense of satisfaction. likewise, it to pay the bills.