If you look at this verse and the following one you see a parallel thought process. The difference seems to be the scope of the results to foolishness. In this verse it seems to be focusing on our everyday lives. Foolish talk can get us in a pickle. The next verse seems to be focusing on the eternal. Foolish talk can send us to Hell.
Wow! I was just joking. Actually, God wasn’t. It was still foolish. There is a well known verse on this.
(James 3:6 KJV) And the tongue is a fire, a world of iniquity: so is the tongue among our members, that it defileth the whole body, and setteth on fire the course of nature; and it is set on fire of hell.So? Think back over your day. Think forward to what is coming. Do you see any patterns you can change the might lead you in the paths of righteousness instead of the folly of loose lips?