The believer will possess God's peace under Satanic attack. Now may the God of peace who brought up our Lord Jesus from the dead, that great Shepherd of the sheep, through the blood of the everlasting covenant, make you complete in every good work to do His will, working in you what is well pleasing in His sight, through Jesus Christ, to whom be glory forever and ever. The God of peace who raised Jesus from the dead has the power to enable us to do his will. Peace is more than the absence of trouble to the Jew. It is more than a negative thing.
Peace is the whole person at rest.
It is anything that that makes for the good of the individual. In this context it is peace in the sense of harmony. Euodia and Syntyche were at odds. Their relationship needed to develop into a harmonious whole. It is only from the source of God that we are able to enter into a whole relationship with fellow believers.