I’m just wondering - are impure thoughts, even the worst kind, mortal sins. Even if you try to stop them and you never try to start them in the first place - they just pop up? If you want to recieve the Eucharist, but I don’t think you’ll get to go to confession before the next mass can you?..are these thoughts mortal sins?
Speaking as someone who has scruples, I can tell you that impure thoughts which just pop into your head are not your fault. Sometimes they are the devil trying to tempt you to sin - especially if the same thoughts keep on returning - and other times they are just thoughts that come up, without you’re thinking of them. In either case, I’ve found that the best way to combat such thoughts is prayer and thinking. Say a Hail Mary, or an Our Father, or the Jesus Prayer, or some other prayer. Then, before you think you’ve committed a mortal sin, think it over:
Did you think the thoughts yourself, or did they just pop up?
Did you entertain the thoughts, or did you try to resist them?
Did you know the thoughts would come, or did you not know?
If you said Yes to all three questions, than it is sin. If not, fear not, for it is not sin.
Also, a good advise that many people forget to give: NEVER trust the devil. He dose not tell the truth - ever. So if he tells you you sinned, don’t believe him. Don’t reply to him, either - he loves attention. Just ignore him. Just make the Sign of the Cross. Satan cannot stand the Sign, and he flees from you as soon as you make it. The reason is because he hates the Mercy of God.