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I came to the Messenger of Allaah (sallAllaahu alayhi wa sallam) and he said : “You have come to ask about righteousness”. I said : “Yes”.
He said : “Consult your heart. Righteousness is that about which the soul feels at ease and the heart feels tranquil. And wrongdoing is that which wavers in the soul and causes uneasiness in the breast, even though people have repeatedly given their legal opinion [in its favour].”
"— Hadith on the authority of Waabisah bin Ma’bad (radiAllaahu anhu)