Remind me again what Phil 2:12 says?
Therefore, my beloved, as you have always obeyed, so now; just as in my presence, so much more in my absence, work out your own salvation with fear and trembling. For God is at work in you, both to will and to work for His good pleasure.
(We're Biblically illiterate here, so we've memorized Philippians 1 and 2.)