We are all born with the effects of Original Sin in our souls which leave their mark by a proclivity to sin. We can see that most clearly in our disordered desires. Some examples would be: desiring junk food, over-eating, over-sleeping, over-drinking, spending too much money on frivolous things, gossip, base humor, feelings of superiority, judging other people, need for attention and admiration, lust, etc. All of this is further compounded by our personal sins which lead to sinful habits.