Salt was thought to be an antidote for poison

To add another layer of complexity, Pliny was not the originator of this concept. Instead, he was recounting the events following the third Mithridatic War, during which Rome triumphed over the Persian Kingdom of Pontus. After defeating Mithridates, the king of Pontus, the Roman general Pompey rummaged through the belongings of the vanquished. Among Mithridates' possessions, Pompey discovered an antidote that, according to Mental Floss, instructed: "Take two dried walnuts, two figs, and 20 leaves of rue; crush them all together, adding a grain of salt." This mixture was believed to safeguard the drinker against poisoning.
There is another narrative regarding the phrase's origin that also involves poison. According to this story, another Roman general (not Pompey) would consume small doses of poison to build up his immunity. To enhance the flavor of the poison, he would sprinkle a grain of salt on each dose. However, this account is not widely accepted due to insufficient evidence, and when considering the contemporary interpretation of the phrase, it seems illogical. After all, a grain of salt serves as an antidote, not a disguise for poison and misinformation. Nevertheless, it’s important to choose the finest salt available.
The modern meaning

Jump ahead to the 17th century, where we encounter one of the earliest (somewhat) contemporary uses of the expression "take with a grain of salt." In his work "Commentary on the Old and New Testaments," John Trapp stated, "this is to be taken with a grain of salt." There has been some discussion regarding Trapp's precise intent, but scholars suggest that he was likely hinting at a meaning similar to today's interpretation of not accepting something at face value. Fast forward a few centuries to 1908, when the American literary journal The Athenaeum employed the phrase to clarify why it would not publish less-than-reliable photographs of early Ireland. Meanwhile, in the U.K., historian F.R. Cowell first introduced the term "pinch of salt" in his 1948 book, "Cicero & the Roman Republic." It appears that when it comes to grains of salt, all paths indeed lead back to Rome.
In contemporary usage, we primarily use the phrase "take with a grain of salt" to indicate that one should not place too much trust in information from dubious sources. These sources can range from unreliable news websites to local gossip, or even one's own inner critic. While a grain of salt may not actually safeguard you from poison, maintaining a healthy level of skepticism is an invaluable tool for navigating the vast array of information in today's world.
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