1. Mozart: Many people use the happiness of youth as the price of success;

2. Shakespeare: Youth is a raw material that must be shaped sooner or later;

3. Romain Rolland: The instinct shown by youth power is to oppose other youth forces or to selectively combine with them, because all kinds of ideas are attractive. They first hesitate to explore, try, and settle on two or three goals. Wander around for a while, then make a decision and choose friends from each other.