放纵青春只会徒增伤痕
[fàng zòng qīng chūn zhĭ huì tú zēng shāng hén]
'Indulging In Youth Only Increases Scars' is a wise or regretful statement about youth wasted. This implies recognition that excessive carefree indulgence in youthful pleasures might lead only to suffering and regret later on.