My Dad has had depression issues for the last couple of years. A great deal of this stems from his hatred of his father who was truly a terrible, evil person. Tortured and abused by this man, he felt a true sense of relief when he passed away a few years ago. However, because my Dad is such a good, decent, and sensitive man, he feels guilt over the fact that whenever he thinks of this person he feels the hate swell inside of him. This leads to my opening question, "is it ok to hate"? He feels that only when he forgives his father will he truly be free. I believe that some people are worthy of your hatred and it's perfectly fine to feel that way about them.

Any thoughts? Thanks.