God' power is at work in us, signifying the church which is a collective body comprised of those called out of the World. This quantitative power or energy is released in all its fullness. I think the power is not evident as it should because we first have to believe as verse 19 indicates "for us who believe." The exercise of Christ' power brings glory because of the internal power itself that abides in the church. Hence, when this power is manifested which in essence is the power of God working through the Church - the ultimate result will be God' glory manifesting on the earth.