We want to glorify God with every area of our lives, and that includes what we do with our finances. We are stewards of everything God has given and provided for us in our lives. He entrusts us to give to Him what is already His, which is 10% of our earnings. In doing this we are showing our trust in Him and honoring and acknowledging our covenant with God, the savior of the World. When we trust Him with 10% He expands our 90% beyond what we can ask or think.