Shouldn't we give our everything if God gave us His everything? Giving as a "cheerful giver" demonstrates sacrifice and gets the attention of the One who supplies and multiplies!
But since you excel in everything—in faith, in speech, in knowledge, in complete earnestness and in the love we have kindled in you—see that you also excel in this grace of giving. I am not commanding you, but I want to test the sincerity of your love by comparing it with the earnestness of others.
2 Corinthians 8:7-8