But Abel, by faith in a future Redeemer, offered to God a more acceptable sacrifice than Cain. His offering the blood of beasts signified that he was a sinner and had sins to put away, and that he was penitent and believed in the efficacy of the blood of the future great offering. Satan is the parent of unbelief, murmuring, and rebellion. He filled Cain with doubt and with madness against his innocent brother, and against God because his sacrifice was refused and Abel’s was accepted. And he slew his brother in his insane madness. (Con 23.1) MC VC