What is the definitive meaning to the saying “Good deeds brings wholesome results and bad deeds produce retribution”?

What is the definitive meaning to the saying “Good deeds brings wholesome results and bad deeds produce retribution”? Luangphaw can you please help clarify this for me because people nowadays believe that doing good deeds does not necessary lead to good results. However, they believe that misdeeds can yield benefits. What has led them to think in this way?