(Pro 23:16 KJV) Yea, my reins shall rejoice, when thy lips speak right things.
The KJV has “reins” for “inmost being” (3629). Reins. Really? The Hebrew word is literally “kidney” as in “I love you with all of my kidneys”. If you think about it there is a concept that you can wrap your head around. Reins are what are used to control the horses that power the chariot. They are what the cowboy hero was trying to get hold of as he hung under the charging horses in the old westerns. It is saying we need to rejoice with what controls us.
So? If you can’t understand this kind of joy find an infant that is old enough to respond but has no sense of embarrassment. Get it excited and its entire body will wriggle. We need to get that jazzed when someone does the right thing.