The Talmud begins the second chapter with a Mishnah teaching that a vow stating a permitted item is now like something intrinsically forbidden by the Bible is not a valid vow. Linking permitted to forbidden only works when the already forbidden item became prohibited through a vow or oath. If something was always off limits, like pigs are for Jews, then a vow that something is like pig is not effective.
Among these items is “orot levuvin” meaning de-hearted hides. These were the skins of animals that were used for idolatry through removing the beating heart from the animal. The skins were recognizable from the cuts made to access the heart. This form of idol worship is featured in the 1984 film Indiana Jones and the Temple of Doom.
It is interesting that the idol of a non-Jew loses its forbidden status if the owner decides that it is no longer his deity. However, objects offered to an idol, like these hides, can never lose their taboo.
We can extrapolate a practical concept from here. A man who was devoting his life to a certain cause or person, and then changed his mind, no longer has the same attachment to that prior focus. He creates a radical change in his psyche and how he views the object.
However, whatever time, money, energy, and resources he already sank into this cause, occupation, or relationship are gone forever. If you (figuratively) gave your heart to someone, you don’t get back your emotional investment when the situation ends. Be careful who and what you invest yourself into.
The Mishnah also brings a surprising teaching:
If a man says to his wife: You are hereby (forbidden) to me like my mother, this does not make a valid vow. This is because his mother was always forbidden to him as the Bible prohibits such incest. However, our sages require the man to go to a sage to annul his vow anyway, so that he will not take actually binding vows lightly.
The Ran explains that men would sometimes make such statements out of anger. Even though this isn’t a binding vow, if there are no consequences, then he will make more such vows when they fight. Eventually he will be truly forbidden from remaining married to his wife (if he will not annul his vow).
It is interesting that women typically hate to be compared to a man’s mother. However, many men marry women who have similarities to their own mothers. One of the worst things to say to a wife is that she reminds you of your mother.
Even when there is tension, be careful how you speak to people and avoid making oaths and ultimatums during an argument.