Having ill will or feelings for another person is never productive. In 1 Peter 2:1 Peter says, Therefore, rid yourself of all malice and all deceit, hypocrisy, envy, and slander of every kind. When you hang onto these feelings, it does more to harm you than the person you are feeling it towards. More importantly, it is against what Jesus called us to do when He told us to love Him and to love others.