Too many professed believers in Christ are resting on their laurels—are living like they are satisfied with their past achievement (salvation), so much so that they refuse to consider additional effort from them is necessary. They have assumed that their salvation automatically made them the Bride of Christ—made them saintly Overcomers. As a result, they either overlooked the Scripture that commands them to work out their own salvation, or they read and studied said Scripture but concluded it does not pertain to them.
If we are God’s children, then we need to learn how to let go of our own will and let God do what He Wills. When we become this submissive, that is when He pours into us His perfected Peace, Joy, and Strength so that we will be able to endure life’s setbacks and hard times.
The ultimate goal of every believer is NOT to make it into Heaven. The ultimate goal of God’s salvation plan is to have every single one of His sons and daughters achieve Christlikeness. The only way to achieve this goal is to work out everything God has worked into each believer—to work God’s Perfect Will out of each believer. God’s Perfect Will in the believer is His Holy Spirit, who is every believer’s Source of power, authority, gifts, practical sanctification, and so forth.