Look carefully at this statement by the Apostle Paul:
Alexander the coppersmith did me great harm; the Lord will repay him according to his deeds. Beware of him yourself, for he strongly opposed our message. 2Tim 4:14-15
We know that Christ calls us to forgive one another. We are to love our enemies and do good to them (Matthew 5:43ff; Romans 12:19-20). We are not to take vengeance against them, but to leave it to the Lord to effect justice. (I am still researching whether or not we are commanded to forgive our enemy. We are to love our enemy by doing good to them, not returning evil for evil 1 Thessalonians 5:15; 1 Peter 3:9).