Philippians 2:12-13
12 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, 13 for it is God who works in you, both to will and to work for his good pleasure
v.12 Paul moves from theological concept of Christ death and resurrection, to how to implement it in daily life.
The way to continue obeying Christ is to work out. The imperative means “to cause a state or condition, bring about, produce, or create.” A few examples will illustrate Paul’s use of this word. “The law brings wrath” (Rom 4:15); “suffering produces perseverance” (Rom 5:3); “sin, seizing the opportunity afforded by the commandment, produced in me every kind of coveting” (Rom 7:8); “our light and momentary troubles are achieving for us an eternal glory” (2 Cor 4:17). Paul uses this word to call his friends to bring about, produce, achieve, or create something.