There are inevitable regrets in life. What you encounter will turn into a huge force to push you forward at a certain moment. After this force is burned out, it will become endless emptiness. So you can't avoid falling into despair. You look around for direction, but you find that the only way to get rid of it is to follow the way you came, turn back and go again. But you can't accept the exit without doing anything. Even if you know that what is blocking you in front is the giant peak you can never arrive, but your courage, the courage make you don't fear, will make you reach an unprecedented peak on this mountain，that is enough