why do we do good?

Ok, I am a little embarrassed about having ramblings on Sunday... but they are for a good cause.
So as I was driving home from church in this nice brisk weather my mind wandered a bit to a thought of... "why do people try to be good?". Really think about it. They are embarassed mostly when they mess up, like say the wrong thing, when they are caught steeling, when they are caught cheating on tests. You can lump me into that as well because I have felt bad during those things. So I then shifted my thinking a bit about evolution, and survival of the fittest. I have heard it said before that if we are a product of these two things then why do we reproduce. Good question. Let's pose another question however. Let's say that if we are indeed a product of evolution and survival of the fittest then why do we care what others think? Why do we try to do good things. Why when you talk to people they are always "trying" to be good. Most people will agree that they aren't the best people in the world but they are willing to admit that they are good... So why do we even try? I am going to venture to say that it is the Holy Spirit working inside us. Through talking with our conscience, the Holy Spirit gives us a longing to be good. Now... what is good? I am glad you asked. This will be something I cover in my next post... however if you think you are good click here.