Help spread gratitude in the world. If you know that someone has done something that was beneficial to another person, let the recipient of the benefit know about it. Point out to him that he should be grateful to his benefactor.
In situations when the benefactor did not purposely want to keep the matter a secret, by telling the one who benefited from the kindness that he has what to be grateful for, you are spreading positive feelings and goodwill among the Creator's children.
Love Yehuda
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