God is generous and so he calls us to be as well. What we do with what God has given us shows the world where our hearts are at and helps proclaim the gospel. We want to glorify God with every area of our lives, and that includes what we do with our finances.
John 3:16 New King James Version (NKJV)
16 For God so loved the world that He gave His only begotten Son, that whoever believes in Him should not perish but have everlasting life.