It’s like the cartoons where there is an angel on the right shoulder, and a devil on the left, and your conscience has to choose between each of their suggestions. When you choose wrong, the Holy Spirit knows about it, and when you choose right the devil knows about it.
But imagine someone not having an ‘angel’ on their right shoulder, but a devil on each side- they would have a false humility, convincing themselves they are a good person, as a justification to indulge in their own self-centered-ness. I am so thankful I have the Holy Spirit- otherwise I would be my own god.