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Yes one needs a moral certainty…but this is not uncompatible too with the coexistence of certain “feelings” (negative doubts…unreasonable fears etc) and those fears from scruples etc…But that doesn’t seem to be the question in the OP.
Read this article
If you are not certain whether something is sinful, you have to then make the judgment as to whether it would be a sin given the lack of certainty you have based on any relevant factors, including the moral system – see the article – you judge to be best when dealing with such situations. If after all that you are still anxious, then it’s not going to be a mortal sin; find a good priest and follow his advice.
And one must note that these various “moral systems” and the debates between them developed within a particular time (article is from around 1913)…and that the Church has called for a “renewal of Moral Theology”…which has been taking place in orthodox Catholic Theology…see for example Fr. Pinckaers et al. (which does not mean all is scrapped! but one does need to see the whole from Apostolic times to present…)
Also those with scruples to various degrees…ought to seek to avoid scruples in this question and speak with their confessor and follow the principles given them etc…
(even during that time when such “moral systems” were in hot debate with one another (when that article was written)…scruples were seen as a different thing (indeed they are)…that the person was troubled often not by the kind of lack of moral certainty the article refers to …but of a speculative kind…and the kind that was from scruples…thus they would be given often principles to guide them…their scruples placed them in a different boat the other Christians in this regard…for it was not “their conscience” really that was causing the problem but rather their fears…their scruples etc…so with the direction and various principles from their confessor etc …they would learn to ignore the scruples etc…the fears…and act against them…not as real practical doubts…but as what they were…and they would not “sin” by so doing…(and of course this can still be valid today)