Everything we have belongs to God - point blank. The entire universe and everything in it is His. If it were not for what He has done - we would not have what we do. Because of this we honor him with our giving.
God's impact is needed everywhere. Giving allows God to move in others lives, our community, and even globally. It also allows us to open ourselves up for change and blessings!
We are instructed to be good stewards of our finances. Giving shows God that we are able to manage what He has given us in a selfless way.