Read Pastor Phill Pringle's articles:

Good people think and feel of other's heart and mind before they say anything.
Fools say the first thing they think of, which will be stupid. The crazy things is they fail to read the signal that everyone listening is turned off.. They just keep on talking without stopping.

Proverbs 16:23
"The heart of the wise teaches his mouth, and adds learning to his lips."

We should speak at the pace of our heart, not the pace of our brain. The heart moves slowly but wisely. The brain moves quickly but not wisely. The brain has knowledge. The heart have wisdom.