If money or affection or power are sought in disproportionate, obsessive ways, then sin occurs. And that sin is magnified when, for these lesser goals, we fail to pursue the highest good and the finest goals. So when we ask ourselves why, in a given situation, we committed a sin, the answer is usually one of two things. Either we wanted to obtain something we didn't have, or we feared losing something we had. Sin impairs the sight, and works toward blindness.
Sin benumbs the hearing and tends to make men deaf.
Sin perverts the taste, causing men to confound the sweet with the bitter, and the bitter with the sweet. Sin creates callosity. It hoofs the spirit, and so reduces the area of our exposure to pain. John Henry Jowett in The Grace Awakening. It's never over.