Where do Emotions Come From???

Where do emotions come from? Why do we have them? What use do they have?

I believe they allow for the appreciation of true beauty in all its capacities. It allows for a genuine experience of true beauty. I have also heard it put that emotions are the heart speaking. Emotions let us know when a given reality registers within our personhood. Where as the 5 senses give us objective experiences of the world around us, emotions involve our reaction to them. However, beauty cannot be sensed. It can only be felt. Beauty must be experienced within. You can see, touch, taste, hear, and smell the environment and experiences around you. Yet how do you know if they are beautiful to you or not? Answer: the presence of emotions.
I read an interesting quote on a friend's fridge:

"Love is friendship on fire."

A lot more goes into love than a friendship on fire. True love brings the Light to the stained glass window. However, within the realm of romance, this quote does stake a good 1-line definition.