Okay, I want you to put all of the toothpaste back into the tube. Once you have said it, it is said. You can't put the words back in your mouth any more than you can squeeze this toothpaste back into the tube. That is why we need to be very careful about the things we say. That sounds nice, but it just isn't true.
Words can hurt.
Our words can cut like a knife. They can hurt others. We all know that God hears every word we say and he knows every thought we have in our mind. It is very important for us to be careful about the things we think and say. Once we have said it, we can't take it back, so let's make sure that our words are pleasing to God.