God is himself at work within you

^12-13 So then, my dearest friends, as you have always followed my advice—and that not only when I was present to give it—so now that I am far away be keener than ever to work out the salvation that God has given you with a proper sense of awe and responsibility. For it is God who is at work within you, giving you the will and the power to achieve his purpose.

^14-18 Do all you have to do without grumbling or arguing, so that you may be God’s children, blameless, sincere and wholesome, living in a warped and diseased world, and shining there like lights in a dark place. For you hold in your hands the very word of life. Thus can you give me something to be proud of in the day of Christ, for I shall know then that I did not spend my energy in vain. Yes, and if it should happen that my life-blood is, so to speak, poured out upon the sacrifice and offering which your faith means to God, then I can still be very happy, and I can share my happiness with you all. I should like to feel that you could be glad about this too, and could share with me the happiness I speak of.