There is much insight dedicated to the topic of forgiveness that has been passed down for centuries. There is a particular sequence of words, however, that seems to hold volumes of raw, powerful, truth: “Holding a grudge is like drinking poison and waiting for the other person to die.” These words, spoken by Buddha, are meant to penetrate the issue and generate thought. It's a quote that makes you think, and in return, gives you that “Ah ha!” moment.
We live in a society of rules and laws, but there are some laws of nature that simply cannot be broken. They are often referred to as universal laws, one of which we are all familiar - whatever energy you send out you get back tenfold, or a more commonly used cliché, “What goes around, comes around.” This is the law of Karma.
When we hold a grudge against someone it may end up harming them, but it most certainly harms us more; and in more than one way. Not only is it harmful emotionally and spiritually, but over time, it can make you physically ill. Giving power to such negative feelings is exhausting.