Romans 9:23-24 And that he might make known the riches of his glory on the vessels of mercy, which he had afore prepared unto glory, Even us, whom he hath called, not of the Jews only, but also of the Gentiles?
The glory of God is greatly revealed within a fallen world. We are surrounded by depravity and lustful desires. When God reaches into the mass of wickedness and cleanses a man or woman of sin, changing a life eternally, His glory is revealed for all to see.
We are incapable of such a transformation within ourselves. God alone can take a heart of stone that is prone to sin and create a heart that is tender toward Him---a heart that seeks righteousness.
Every born again believer bears witness to the great glory of the God who redeems.