Personal salvation brings with it responsibilities which Paul related to Christians’ obedience. The responsibility was to live in accord with their salvation, letting the implications of their relationship with Christ transform their social relationships. Paul really meant, in the first place, that they were to act like Christians
You have been fully delivered. Allow your salvation to fully affect your life.
Fear and Trembling - a sense of “Am I doing this right?” Its implies intentional, thought out obedience instead of a casual or accidental obedience