"One man gives freely, yet gains even more; another withholds unduly, but comes to poverty"
My mother used to say: 'What goes around comes around." She said this in order to discourage me from rash acts of reprisal against ill-manners or unfairness. She believed that meanness had a way of coming back on the heads of the mean. I think there's some truth in what she said, as there is also on the proverb. Unselfishness can realise some vindication in this life but I think it will take another world beyond to make things as right as they ought to be. And that, of course, is the hope to which this truism points.