Good and evil.

Exactly. And I: I follow the voice of Reason and the Bible (not Orthodoxy and Catholicism, but rather Protestantism, and only what does not contradict the Bible). You cannot follow your heart. To follow your heart, you need to have a pure soul, which, unfortunately, I do not have.
Perhaps the example is not relevant, but:
When I first encountered pornography (on a local network 4-5 years ago), I was shocked. It both attracted and repelled me; it was painful to watch, and I felt nauseous afterward! Nevertheless, later I changed my attitude towards it, but now I react either with interest or, in parallel, and only Reason tells me that it is Evil and does not suit my nature. It saves me. The heart is a flexible concept. Often, it is confused with intuition, impulses, passion, and desire. "Listen to what your heart tells you." The heart says: "Go, avenge your brother and kill." And reason politely reminds you of the law, of prison, of the grief you will bring to relatives. Those who follow impulses are unpredictable and inconsistent; you can expect anything from them, even betrayal.

All this is IMHO and my experience, ladies and gentlemen.