Summary: Paul wrote chapter 8 of Second Corinthians to lay out 9 guidelines for what it means to give to God. In chapter 9 he is showing us that there are many wonderful rewards and joys when we give like God wants us to give.
Purpose: To describe the result of proper giving.
Aim: I want the listener to see giving as a reflection of the Gospel.
INTRODUCTION: A man was struggling to pay his bills on time. One day he received a letter from one of his creditors demanding that he immediately pay what he owed. He sat down and wrote a letter back and said, "Dear Sir, Every month I take all the bills I have and put them on the table, shuffle them, and I pay the first six bills on top. Now, if I have any more trouble out of you, next month you'll be out of the shuffle entirely."
The sad thing is that many Christians have shuffled God right out of their giving. They pay for their own needs and desires with little thought of how God wants them to use the money He has given them.
Paul wrote chapter 8 of Second Corinthians to lay out 9 guidelines for what it means to give to God. In chapter 9 he is showing us that there are many wonderful rewards and joys when we give like God wants us to give. Look back at 2 Corinthians 8:10: "I give my opinion in this matter, for this is to your advantage, who were the first to begin a year ago not only to do this, but also to desire to do it " (NAS)
Paul is now giving us some of those advantages.
Vs.1-11 I. What Happens When We Practice God Centered Giving?
Vs.1-5 A. God centered giving encourages others to give "your zeal has stirred up most of them"
Vs. 1-2 1. We must decide to give "I know your readiness"
Vs.3-5 2. We must plan to give "arrange beforehand your previously promised bountiful gift"
Vs.6-11 B. God centered giving will bring God's blessing
Vs.6 1. When we give generously "he who sows bountifully will also reap bountifully"
Vs.7 2. When we give with the right motive "not grudgingly or under compulsion"
Vs.8 3. When we trust God's promises "God is able"
Notice what God is able to do: "... make all grace abound to you, so that always having all sufficiency in everything, you may have an abundance for every good deed" (2 Corinthians 9:8, NAS)
"It might be profitable here to notice Paul's use of the concept of abundance as he wrote this letter. He opened the letter with abundant suffering that was matched by abundant comfort (2 Cor. 1:5). He also mentioned abundant grace (2 Cor. 4:15) and abundant joy and liberality (2 Cor. 8:2). Because of God's abundant grace, we can abound always in every good work (2 Cor. 9:8). The apostle saw the Christian life as one of abundance, for Jesus Christ can make us adequate for every situation." 
Often we don't give to God because we are afraid that we won't have enough left to take care of our future needs. Paul encouraged the Christians in Philippi to give generously because: "...God will supply all your needs according to His riches in glory in Christ Jesus" (Philippians 4:19, NAS)
So the only question that remains is: Do we believe that? "Trust in the LORD forever, For in GOD the LORD, we have an everlasting Rock" (Isaiah 26:4, NAS) "and being fully assured that what God had promised, He was able also to perform. " (Romans 4:21, NAS)