Ecclesiastes 11:9-10 New King James Version (NKJV)

9. Rejoice, O young man, in your youth,And let your heart cheer you in the days of your youth;Walk in the ways of your heart,And in the sight of your eyes;But know that for all theseGod will bring you into judgment.

10. Therefore remove sorrow from your heart,And put away evil from your flesh,For childhood and youth are vanity.

Ecclesiastes 11