A little sign caught my eye: I have often regretted my speech, seldom my silence. Ecclsiastes 3:7 instructs us another way, "A time to keep silence, and a time to speak." This is particularly true when we are angry. Words can build up or tear down and can never be taken back.
Silence is best in moments of anger - usually the words that come out of our mouths will be detrimental rather than helpful. James 1:19 reads, "My dear brothers and sisters, take note of this: everyone should be quick to listen, slow to speak and slow to become angry."
When we find ourselves in a tense situation or in the middle of an escalating discussion, Proverbs 15:1 recommends "A soft answer turns away wrath, but a harsh word stirs up anger."
Sometimes being quiet is a struggle but if we remain silent it can help us to avoid sinning. "Therefore the prudent keep silent at that time, for it is an evil time" (Amos 5:13).
On the other hand, silence is harmful if we are silent rather than speaking out when an opportunity arises to share our faith. "Instead, you must worship Christ as Lord of your life and if someone asks about your Christian hope, always be ready to explain it" (1 Peter 3:15).