It is God who works in you.

Philippians 2:12-16, Therefore, my beloved, as you have always obeyed, so now, not only as in my presence but much more in my absence, work out your own salvation with fear and trembling, for it is God who works in you, both to will and to work for his good pleasure. Do all things without grumbling or questioning, 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, 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.

If it is only up to me to work it out, I know that I am not up to it. Fortunately, He is the one who gives us the will, and who works in me. He is the light of the world. Am I allowing Him “to will and to work for His good pleasure?” Am I letting His light shine?

Work in me today according to Your will; let Your light shine even when I am tempted to complain!

ESV Lectionary