When we use our word against ourselves it is emotional abuse, and it puts us in emotional hell. You might say that it is a sin that makes us suffer. Not a sin in a religious way, but in the early Latin meaning of the word. Any wrong-doing is a sin. To hurt ourselves is to sin against our self. To hurt another whether with our words or actions is a wrong-doing. There doesn’t have to be any god, heaven, or hell involved for it to cause suffering. When we commit a wrong-doing against our self, even just criticize our self, we suffer emotionally.
It may not be easy to measure if you are impeccable with your word, but if you pay attention to your emotions you can quickly notice when you are not.