Compare ch. 1:18. This is the standard by which God bestows His blessings upon mankind, hence the limitless resources available to the child of God. Man measures by his own weakness and insignificance; God by His unlimited riches and glory. Paul is not satisfied that his converts should become merely nominal Christians. He wants them to receive abundantly of the graces, to plumb the depths and scale the heights of spiritual life, to partake of the glorious riches of the kingdom of God.
Strengthened with might.
The might that strengthens is the power of God. The power is conveyed through the operation of the Holy Spirit. The same power that converts men must continue in them if there is to be Christian growth. Here is where many Christians fail. They do not recognize that spiritual endurance requires as much of the grace of God as did the initial conversion. As the physical strength is increased by food and the intellectual life by thought, so the spiritual life is sustained by the immediate presence and power of the Holy Spirit.
In the inner man.
The Greek suggests power entering into and remaining there. The vital spiritual powers within a man have not sprung from his own nature; he has nothing of his own to offer, nothing of his own of which to boast.