Freud wrote of the "beast within," Conrad of the "heart of darkness."  
Suppose for a moment that the blackness in man's heart is like cancer 
cells:  a person can have 10 such cells or a million---either way, one 
still has the cancer, right?
So all hearts have a measure of this cancer, and consistent with the
 nature of the disease, the cells at all times have the potential for 
multiplying furiously, causing such noxious outbursts as fornication, adultery, perversions, divorce, alchoholism, fraud, robbery, torture, pedophilia, rape, 
persecution, murder and war.
Where the cancer cells are not yet as numerous, one finds "merely" 
selfishness, quarreling, cheating, lusting, deceifulness, gossip, 
malice, and other such "minor" infractions.  But notice how the "minors"
 are seed versions of the "majors"!  Unbridled, deceitfulness and 
cheating grow into fraud and theft; lusting into fornication, adultery, 
or pedophilia; gossip into persecution; malice into torture or murder; 
quarreling into divorce or war, and so forth.
What treatment for this disease?  A very distinct form of radiation 
therapy:  massive doses of light, perhaps?  And a heart transplant.  The
 human soul needs a complete dialysis to cleanse it of the old 
impurities.
