There is one word that is so powerful that it can change your world. That word is 'so'. The reason that it's so powerful is that it frees your mind and soul from things that are messing with your mind.
Someone just said something hurtful to you? Best response is "so?". Cause what does it really matter what others say about you? The only place this matters is in your mind. And you have the power to release yourself from that burden. Just say "so?"