This lower nature in humans is symbolized as Satan — the evil ego within us, not an evil personality outside.
Should anyone be afflicted by a sin, it behoveth him to repent thereof and return unto his Lord. He, verily, granteth forgiveness unto whomsoever He willeth, and none may question that which it pleaseth Him to ordain. He is, in truth, the Ever-Forgiving, the Almighty, the All-Praised.
Watch over yourselves, for the Evil One is lying in wait, ready to entrap you. Gird yourselves against his wicked devices, and, led by the light of the name of the All-Seeing God, make your escape from the darkness that surroundeth you. Let your vision be world-embracing, rather than confined to your own self. The Evil One is he that hindereth the rise and obstructeth the spiritual progress of the children of men.