Phillippians 2:14-16

 [14] Do all things without grumbling or disputing, [15] that you may be blameless and innocent, children of God without blemish in the midst of a crooked and twisted generation, among whom you shine as lights in the world, [16] holding fast to the word of life, so that in the day of Christ I may be proud that I did not run in vain or labor in vain.
(Philippians 2:14-16 ESV)