I have sometimes heard this expressed "Some things are better left unsaid which I generally realize right after I have said them."
When we hear something, it is so easy to, shoot from the hip so to say and answer with the first thing that comes to our mind. We don't think about how our responses will be seen by those might who hear them.
It is bad enough when we speak it. Today's digital technology can be even worse. Tweet it, put it on Facebook or even say it to someone's voce mail can be a real problem. It is out there for everyone to see and we can't bring it back.
Better to think about the consequences of what we say and, many times, think the thoughts but don't say them. Some things are better left unsaid.
