The way you know you'll receive 7 times what you give, John, or in some cases 4,900 times what you give, is that the giving gives you true joy without any thought of even receiving 1 times back. 

Nice R.O.I., 
  The Universe
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Oh, the 4,900 multiple, John? Yes, this was overlooked by your parables because it was never quite understood. To quote, "Verily, he or she who gives, without any thought of receiving, will receive 7 times recompense for their offering, while those who do so with an authentic glad heart, happy dance, or 'Whoohooo!' will receive thy 7 times recompense 700 more times."
You have the power...