I read recently on an Ask an Apologist thread that desecration of the Eucharist is cause for automatic excommunication. I assume this would include having impure thoughts about it.
For example, let’s say that someone read that and is wondering whether having impure thoughts about it would get someone excommunicated, and as they are thinking that, they are suddenly attacked with one. They fight it off, but continue to have these thoughts throughout the week, always fighting them off. Then, one day, they feel like one is coming and they try to dispel the thought then and there, but it continues to linger in the back of their mind and they don’t feel like they are doing enough to get rid of it, almost as though they feel like as soon as they let their guard down, the predator that is the thought will attack them. Thus, they call the thought forward and fight it off then and there, and sometimes before it even begins to approach the forefront of the mind. Would forcing it upon themselves in order to fight it off more directly be grounds for automatic excommunication?
Also, another question: Would taking the Eucharist in a state of mortal sin be desecration of it? Let’s say they have full knowledge and full consent when they committed the initial mortal sin and if they do this, they will commit another. I assume not, because such a sin can be lifted in the confessional.