Psychologically, no one can quit trading because of someone advising him to quit. The main reason a trading quit is because of losses of money from trading. You can see how painful it is to wkrk hard for money. If used for trading, trading will take the person's time and make the person fell exhausted many times but the person continue to lose. If the losses continue, nobody will later advice the trading to quit trading.
Another reading someone can quit is if he is not married before but later got married and having children. He will know he has to quit to be a reliable and a responsible father. To quite trading would be a wise choice for this kind of person. This is in accordance to some researches.
The reasons most people quit trading are losses and having more reliability in the family like becoming a husband and a father.