Your happiness is determined by your karma. You have probably heard the saying, "What goes around comes around." That's the law of karma. Sir Isaac Newton put it this way, "For every action there is an equal and opposite reaction." The Bible puts it this way, "Whatever you sow, so shall you reap." In other words, every action, good or bad, causes a reaction. Good causes good; bad causes bad. It is the simple law of cause and effect.

Joey Green, The Zen of Oz