Sin nature

We are all born with a sin nature. If it was not true we would not have to correct young children. A good example is like walking into the bedroom of a 3 year old and they have colored on their wall. When you ask them who did that... they blame it on their 9 year old brother! I feel like we are all born with the knowledge of right and wrong. There are some that does not have a conscience. I know when I do something wrong; but sometimes I have pushed my conscience aside. Not a good thing.