“…but he said to me, ‘My grace is sufficient for you, for my power is made perfect in weakness.’ I will all the more gladly boast of my weaknesses, that the power of Christ may rest upon me. (2 Corinthians 12.9 – RSV)
“MY grace is sufficient for you.”
I am bold enough to read that as “The grace which is ME living in you and expressing MYSELF through you, is sufficient for you.”
My sufficiency is participating with others in the “shared-life” of Christ Jesus. In so much as I do so (live out baptism by unceasing repentance) I actually share the life of Christ Jesus and HIS life is manifest through me; AND I actually realize and live into the shared-life with others that is ours in Christ Jesus.
“My Lord IS my life,” AND “My brother (and sister) IS my life.”
So, we share in life and life is shared through us.