Now the God of hope - The God who “inspires,” or “produces” the Christian hope.
All joy and peace - Romans 14:17. If they were filled with this, there would be no strife and contention.
In believing - The effect of believing is to produce this joy and peace.
That ye may abound ... - That your hope may be steadfast and strong.
Through the power ... - By means of the powerful operation of the Holy Spirit. It is by his power alone that the Christian has the hope of eternal life; see Ephesians 1:13-14; Romans 8:24.