Verse from 1 Timothy

不要叫人小看你年轻, 总要在言语、行为、爱心、信心和纯洁上，都作信徒的榜样。(提摩太前书 4:12)

Let no one look down on your youthfulness, but rather in speech, conduct, love, faith and purity, show yourself an example of those who believe. (1 Timothy 4:12)