I think we're resistant to thoughts or emotions when they are unacceptable to us for some reason. It might be that we feel they are shameful, or don't make sense, or that only a really bad person would feel this way, etc. That is not our conscious mind feeling that way, but the unconscious. Our conscious mind is logical, but our unconscious just feels the way it does.

For example, I think that we should love our parents. But I have some real anger toward them that I'm trying to get out in therapy. This unacknowledged anger is driving my present life and actions, which makes me wonder why I behave the way I do sometimes. It's extremely difficult for me to get these emotions out - I just block them like crazy! I may go numb emotionally, or my mind will go blank, etc etc etc. I think that's what therapy is all about - working to get these emotions out so they can be recognized and dealt with.

It's perfectly normal to be resistant, and that's your clue that this is stuff that needs to be focused on. If it wasn't a problem, those feelings would just pop right out!