Every one of your thoughts arises within your mind. Some may flow out into the world in the words you use or speak. When you speak uncaringly, it can harm you even more than it hurts others since your unkind thoughts are the most intense inside you.
Make every effort to grab any kind of harmful thoughts in advance of them being communicated. Pause, at that instant, ask yourself do you seriously intend to be this way. Pausing briefly can help to smash the cycle of your conditional reactions, permitting you to transform your thoughts.