Romans 5:12 - Wherefore, as by one man sin entered into the world, and death by sin; and so death passed upon all men, for that all have sinned:

We have all heard about Adam and Eve, the first people ever created, and the story about the apple in the garden is well-known. But, did you know that with that one act, Adam brought the sin nature on all of us who have come after him? Because we are all descendants of Adam, we all have sin in us.