Ecclesiastes 11:8-9 KJV

8 But if a man live many years, and rejoice in them all; yet let him remember the days of darkness; for they shall be many . All that cometh is vanity.
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.