38 Give, and it will be given to you. A good measure, pressed down, shaken together and running over, will be poured into your lap. For with the measure you use, it will be measured to you.” (Luke 6:38 NIV)
The true measure of giving is not in the measure of what we might get in return. We have three things to give; Time, Talent and Treasure.
When we invest any of these in others there is a return. It may not always be self evident, but even if only our contentment is the measure of return, there is a return.
When it comes to God, it is impossible to out give God. He already paid for our salvation. However, he also repays our faithfulness in His due measure.