"Servant" implies work. "Work" is the first word in the verse. St. Paul puts it in the imperative. He mentions fear, an emotion meaningless if the salvation had been already assured. Why do you twist the scripture like that? The meaning is clear, we must work out our salvation every day. The next verse, about God driving the work is not there to negate the previous verse, but to explain that grace is necessary for all good work.
A servant is ALREADY the property of the master .
You want to isolate that scripture for all the others and make it mean what it does not.
It does not say work to be saved
Read it
Phl 2:12 Wherefore, my beloved, as ye have always obeyed, not as in my presence only, but now much more in my absence, work out YOUR OWN salvation with fear and trembling.
HE WAS TALKING TO THE SAVED . THEY WERE ALREADY SAVED,