They never learn to work together as team - working through the circumstances of life and their relationship. They live with everything depending on themselves - trying by their own strength to control each other and life which cannot be controlled. The requirement, Paul writes, is that we have faith in God through Jesus Christ. Grace is when God gives us something we do not deserve - or could never earn on our own. God gives us salvation through Jesus Christ.
Salvation is gift.
And the way to accept that gift is by faith. To trust God that He has given it - and to put our lives in His hands. So many Christians miss this - they accept Jesus as their Savior and then try to live life by their own power and not His. But, if we really have given our lives to God through Christ then we need to rely on His power to live life. Second, Paul prays that you would be be rooted and grounded in God s love and be filled with God Himself.