Pardon me for butting in, but here’s my take on it…if something is shaken up and explodes then what comes out is what was inside. For instance, a bottle of pop will spill pop, a bottle of water will spill water. So, as the scripture says that it is “out of the overflow of the heart that the mouth speaks” then what comes out is basically what is inside of us. That being said, the cursing is an indication that the person needs to put more of God inside and less of the world

Personally, when I hurt myself I usually say something like “O, pain! pain!” or “hot! hot! hot!” and no this is not hiding cursing, I don’t even think those words. Maybe this is a weakness on my part, but when I hear other believers swear it actually hurts my heart.