Fear and trembling - your salvation (Philippians 2:12)

"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" - Philippians 2:12

Why do people always overlook this verse? Apparently the difference between eternity in heaven and eternity in hell is something worth considering. The rest of the Bible seems to make it clear we shouldn't live in fear about being saved or not, but that doesn't mean we shouldn't do what it takes to be sure.

Are you sure of your salvation? How can you be? Do you know if you can be?

Gosh, now that I say that, I'd hate to cause doubts if there need not be any. But that said - fear and trembling - this is a difference between heaven and hell for all of eternity.

Are you serving the right God?