Another Newsvine post, and a good standalone blog post too.

Anger may be irrational, but probably is not illogical. Research has shown that our gut feelings are typically more accurate than long thought out conclusions. That is because when we think things out (now we're entering the realm of my theory, just so you know) what we are actually doing is translating information from our instinctive language into English, our artificial language. Now, you probably know that in any translating job, information can tend to get lost or distorted. Keep in mind, we are born with an empty knowlege slate and the ability to think--and that thinking is in our instinctive language, until we learn English (or whatever) which is useful for communicating with others, and solidifying concepts. I believe animals think with this same instinctive language, though maybe not to the same extent. They just never go verbal with it. But it's pretty obvious that they think, and in a manner very similar to ours in some ways. They also express emotion.
We do not seem to understand truly what emotion is. It is not some terrible behavioral quirk that needs to be suppressed. In reality, it is simply the more noticeable part of this instinctive language. If you observe your thought process, you will find that a thought begins as a feeling, possibly originating from sensory input of some kind, and is then immediately translated by your brain into an English phrase, so quickly that you won't notice that that is how it happened unless you pay close attention.
So next time you have that nagging feeling, or that hanging sense of gloom, or that just plain weird feeling, or incomprehensible joy, or, to be Biblical about it, the "peace that passes understanding" or "groans that words cannot express," pay attention, and try to translate it. You may be suprised at what you find out.