Acts 19:18-20

Many of those who had become believers were coming, confessing and disclosing their [former sinful] practices. And many of those who had practiced magical arts collected their books and [throwing book after book on the pile] began burning them in front of everyone. They calculated their value and found it to be 50,000 pieces of silver. So the word of the Lord [concerning eternal salvation through faith in Christ] was growing greatly and prevailing.