God's Grace and God's Glory

God is the source of the means and the desire to give v8-11a.
Ps 112; Isa 55:10,11; Hosea 10:12 - God blesses his people with temporal blessings and gives grace also to glorify him with them - three practical lessons.

The glory of God in the church resulting from giving v11b-14.
The apostle's mind is full with the realised blessings that would result from the Corinthian's liberality, and just how much God would be glorified by it.

The unspeakable gift of Christ is the cause and motive of it all v15.
The grace of God in the gospel the cause and motive of our obedience - the love of Christ in giving himself for us ought to make us ashamed to be selfish.