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Exactly. As for me, I follow the voice of Reason and the Bible (not Orthodoxy or Catholicism, but rather Protestantism, and only what doesn't contradict the Bible). You can't follow your heart. To follow your heart, you need to have a pure soul, which, unfortunately, I don't have.
Maybe this isn't the best example, but:
When I first encountered pornography (on a local network 4-5 years ago), I was shocked. It both attracted and repelled me at the same time; 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 indifferently, and only Reason tells me that it is Evil and doesn't 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 your relatives. Those who follow their impulses are unpredictable and inconsistent; you can expect anything from them, even betrayal.
This is all IMHO and my experience, ladies and gentlemen.