Your own effort

Isaiah 65:21-22 (Amp) - God describes His  vision for the good life in His new creation:  

"They shall build houses and inhabit them, and they shall plant vineyards and eat the fruit of them.  They shall not build and another inhabit; they shall not plant and another eat . . .My chosen and elect shall long make use of and enjoy the work of their [own] hands."

It's good to be rewarded with the results of your own effort. Real life backs up scripture in this principle. In his book, Gross National Happiness, Dr. Arthur C. Brooks cites studies that show happiness and satisfaction come from achieving success in your chosen goal whether it's a business or a charity or anything else that you consider worth doing.