2. Don't hit the south wall and don't look back: it means that someone is stubborn, can't listen to different opinions, sticks to his own opinions and doesn't think about repentance.
3. A road leads to darkness: When you reach the end of the alley, ancient China practiced the Li Fang system, and the alleys were closed. So a road is dark, that is, it doesn't turn back or turn.
4. Don't die until you reach the Yellow River: it means you won't stop until you reach your goal. If you obviously can't do it, you must do it. If you don't listen to others' dissuasion, you will eventually fail and despair.