青春不狂非菇凉青春不疯非骚年
[qīng chūn bù kuáng fēi gū liáng qīng chūn bù fēng fēi sāo nián]
'If youth is not crazy it's not a girl, if youth is not wild it's not youth (teenager).' Conveys the belief that youthful exuberance, including rebellion, craziness, impulsiveness, etc., is indispensable in life. One hasn't truly experienced youth unless it has included some amount of daring behavior and wildness.