The Days of The Youth

Ecclesiastes 11:9-10
 
9  Rejoice, O young man, in thy youth; and let thy heart cheer thee in the days of thy youth, and walk in the ways of thine heart, and in the sight of thine eyes: but know thou, that for all these things God will bring thee into judgment. 
10  Therefore remove sorrow from thy heart, and put away evil from thy flesh: for childhood and youth are vanity.