It brings more happiness to give than to gain, that's not for giving is sacrfice, but for giving shows kindness of humanity.
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It will be happier to givin than to gain. Not because of giving is kind of sacrifice, but because givig shows the kindness of human nature.
Compared with accepting,giving brings more happiness , not because giving is a sacrifice, but it reveals humality for kindness.
Bring more happiness than getting paid, not because pay is a sacrifice, but because the performance of the goodness of human nature to pay.