"Each one must give as he has decided in his heart, not reluctantly or under compulsion, for God loves a cheerful giver and God is able to make all grace abound to you, so that having all sufficiency in all things at all times, you may abound in every good work" 2 Corinthians 9:7-8
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Everything we have is granted to us by the Lord. As good and faithful stewards of his blessings, it is our act of worship to give back to Him, joyfully, a portion of what He has granted to us so that we may abound in good work for the sake of His kingdom.