This is not a maxim which should be used say, by an investor in the stock market, as an insurance to guarantee profits. It is not a promise of short term material gratification. It is a proverb telling a truth about God's universe. This is a universe tilted in the direction of giving, sharing, and generous good will. In the eternal purview of God, there is no accommodation for Scrooge and his ilk.
I'm busy working on my blog posts. Watch this space!