Mystery, which is Christ in you, the hope of glory.

Colossians 1:24-2:5
I will fill up in my flesh what is still lacking in regard to Christ's afflictions, for the sake of his body, which is the church.
The word of God in its fullness- the mystery that has been kept hidden for ages and generations, but is now disclosed to the saints. To them God has chosen to make known among the Gentiles the glorious riches of this mystery, which is Christ in you, the hope of glory.
We proclaim him, admonishing and teaching everyone with all wisdom, so that we may present everyone perfect in Christ. To this end I labor, struggling with all his energy, which so powerfully works in me.
My purpose is that they may be encouraged in heart and united in love, so that they may have the full riches of complete understanding, in order that they may know the mystery of God.
This is God's open secret: 'Christ - in you!'
A share in God's own glory for every Christian! This is a 'secret' worth knowing.
It makes all Paul's struggle and efforts 'to preach Christ to everyone' worthwhile.
Paul applies to himself the same pattern, of suffering on behalf of others, that was worked out on the cross. He is not adding to that work: Christ's saving work is complete. But in the overlapping of the ages, between Christ's resurrection and his return, God's new people will suffer as their Master did.
Why?
This is the gospel Chris in me, the hope of glory. Paul spent all strength to preach word of God, his purpose is encouraged in heart and united in love among all Christians. So we may have the full riches of complete understanding.
Knowing God knowing the mystery of God need all of my life to make it. God is so high and God is closes to me.
Paul spent whole of his life to full fill his flesh what is still lacking in regard to Christ's afflictions.
Paul did all he can do with the power of the Lord to preach God's word and mystery.
How?
Learn from Paul, preach gospel to others, preach this mystery to others with full riches of complete understanding,