Sin is an intrusion into human life. It was not originally present in human nature. Our slavery to sin originated in human disobedience to God's command (Genesis 2:17; Genesis 3:1-7; Romans 1:18-20). In consequence, because sin had been committed, evil was known; and because the good had been lost it was recognized and longed for.
Adam and Eve were tempted to usurp God's Lordship. Their sin resulted from their willful choice to disobey God and submit to temptation. The role of Satan indicates the pervasiveness and power of evil in our world, but does not absolve us from our responsibility for sin.