We can stop trying to make something of our lives: that's already been done. Christ.
We can stop trying to do things that will assure ourselves of our relationship with God: that's already been done. Christ.
We can stop blaming ourselves for the dust that our lives have become. Everything will return to dust. But our lives will one day be made complete: in Christ.
How do we let days, even weeks, go by that we don't remember Christ and the REST that can be given to us?
"Rest in Christ is the mark of a Christian, confidence in Christ's sufficiency, not ours."