To exercise self-control is a "fruit of the Spirit" (Gal.5:22) and a sure sign that Jesus is in control of our lives.
There are many situations that come before us when it is so easy to lose the plot, and by giving in to the urge to hit back tit-for-tat, we often cancel all the wonderful achievements the Spirit accomplished in our lives.
However, there is a way in which we can rein ourselves in completely... by allowing the Holy Spirit to put a leash on our tongues. To have control over our tongues means that we are spiritually walking on the golden pavements of heaven.
Consider this: An uncontrollable tongue can be like a small match putting an entire forest on fire, whereas a controlled tongue can be like a small rudder steering a big ship through the stormy seas.
We should be extremely careful of how we use our tongues.