Proverbs 15:28
The heart of the righteous weighs its answers, but the mouth of the wicked gushes evil.

God's righteous ones - men and women of wisdom - think beforehand what they should and will say. Their words are not based only on impulse and reaction.

There is little self control when it comes to the mouth of the wicked. Evil words and ideas simply pour out from their mouth, with no wise thought beforehand.

The advice is to say less but better things. When words are many, sin is not absent, but he who holds his tongue is wise. (Proverbs 10:19)

Application

Practice thinking before saying.