Sin is believing the lie that you are self-created, self-dependent and self-sustained.
Saint Augustine... at the beginning of the human race the woman was made of a rib taken from the side of the man while he slept; for it seemed fit that even then Christ and His Church should be foreshadowed in this event. For that sleep of the man was the death of Christ, whose side, as He hung lifeless upon the Cross, was pierced with a spear, and there flowed from it blood and water, and these we know to be the sacraments by which the Church is built up.
Saint AugustineBy means of corporal and temporal things we may comprehend the eternal and the spiritual.
Saint AugustineSin is to a nature what blindness is to an eye. The blindness of an evil or defect which is a witness to the fact that the eye was created to see the light and, hence, the very lack of sight is the proof that the eye was meant... to be the one particularly capable of seeing the light. Were it not for this capacity, there would be no reason to think of blindness as a misforture.
Saint Augustine