What you say can live in the memory of another person their whole life—all the way to the grave. Is that what you want? Surely not! On the other hand, anger properly managed never needs to be regretted or repented of.
Emotions. While they can be a gauge of how you feel and a clue to what needs to be changed in your life, never let emotion alone dictate your decisions.
The devil is thrilled with the current scepticism with which he’s viewed. The more we doubt or downplay his existence, the more he’s free to hurt and hamper us.