And God saw that the wickedness of man was great in the earth, and that every imagination of the thoughts of his heart was only evil continually.
--Genesis 6:5

Think you are the exception to this? That you're a good person? Proposal: lets take a recording of your thoughts over your lifetime and play them publically for all your family and friends. Good idea? Why or why not?

Do your good deeds - when you've helped the poor or whatever -- cancel your evil?