Wisdom got your tongue?

There is a lot said in Proverbs about self control, and specifically about controlling the tongue.

Proverbs 11:
12 A man who lacks judgment derides his neighbor, but a man of understanding holds his tongue.
13 A gossip betrays a confidence, but a trustworthy man keeps a secret."

1) Think of recent times at work or elsewhere when you could have held your tongue but didn't. What would have happened if you had exhibited this level of self control?
2) How well do you keep secrets? Can you be trusted?
3) When are you challenged with betraying confidence or gossiping?