In Psalm 139, David not only reveals what he believes about the bigness of God, but he demonstrates how his 'theology' matters to the daily and difficult circumstances of his life.
For those who were suffering for thier faith in Christ, Peter knew they needed to look to the One they loved without seeing, in order that the unique reality of Jesus would inform their response to their trials.
Just as every Christian is called to a life of submission, Christian wives are called to be subject to their husbands, according to the example of Jesus, in order to shine the grace of Christ to their husbands.
We endure under abusive authority by looking to Jesus' example, not responding in kind, and entrusting ourselves to the perfect justice of God, who will right every wrong in His timing and purpose.