I'll chime in as well too. Every time I've gotten angry (or enraged, or terrified, or depressed, or whatever) and let it affect how I interacted with my wife, the proverbial you-know-what hit the fan.
The oddest thing is that she thinks I have "control" over my emotions. If she could see what goes on when she's not around...
Anyway, I've read somewhere that Taoists think of strong emotions as the "five theives" - they basically steal away what you need to live, whether you call it energy, equinimity, or whatever.
I'm not a Taoist by nature or inclination, nor do I think that I would want to be. But we're all learning that they have a point, aren't we? And if they thought they could get a handle on things, maybe we can too.