From wikiHow:

"Even a fool, when he holds his peace, is counted wise: and he that shuts his lips is esteemed a man of understanding."
Proverbs 17:28 American King James Bible

One of the most obvious and significant attributes of humans is the ability to communicate through speech. An interesting corollary is that we can also communicate our thoughts in real time; we do not need to plan what we’re going to say before we say it. This has both advantages and disadvantages. It would be clearly undesirable for us to have to formulate our thoughts before we issue an immediate warning ("run!") and communication would be dramatically slowed if we were unable to respond, naturally, to people in normal conversation.

On the other hand, this innate ability is often the source of consternation when what we say on the spur of the moment is something we later wish we had either not said, or said differently; it happens to everyone, sometimes, the trick is to remember when. Typically, this happens when we are responding quickly in stressful situations, or during confrontation, although it can happen at any time. Recognizing that we do not always say what we would like to communicate is an important realization – how to help mitigate that issue is not complex, but does require some behavioral changes. The goal is to be aware of when to talk naturally and fluidly, and when to think before we speak... and when not to speak at all.

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