After making a najis object to taharat, after short while if we get a doubt, do we have to be able to recall the act of making it tahir? What if in my mind the first immediate answer to my doubtful question is that it is tahir-but I can’t remember visualizing that act? I frequently make myself contented by remembering and visualizing the act. If I’m unable to remember I get obsessed and feel I may not have made pak. As the first answer I give myself of knowing it is pak- now turns into a doubt and disturbs my mind

This is called an obsession, so do not take care of it, and judge of purity