When the Ephesians believed on Christ, they examined the moral nature of each aspect of their lives. This led them to burn their curious arts books.
Those who meddle with astrologers and sorcerers (and like practices) put themselves on a collision course with God's judgment.
Many unsaved people practice astrology (i.e., horoscopes) and other unscriptural use of the signs in the heavens. Believers should reject these practices.
It is extremely important for everyone to have a functioning conscience. According to Romans 2:15, the conscience works in man to either accuse or else excuse his thoughts. His thoughts further affect his actions. The more often a conscience is ignored, the sooner it loses its capability to work upon man. The same holds true for any conscience defiled by sin. In John chapter 8, as the Lord dealt with the scribes and Pharisees, the desired inner workings of the conscience can be seen. In this instance, the religious leaders brought a woman before the Lord, accusing her of sin. In response, the Saviour suggested that he that was without sin should be the first to cast a stone in judgment. One by one the consciences of the religious leaders convicted them as they turned and walked away.