I learnt where that phrase came from t'other day.

In Medieval times people believed that Salt was a cure for all poisons. So they put a lot of salt on their food (which also explains why we put salt on everything) - ie. took everything with a pinch of salt to avoid being poisoned.

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I agree with you there - that the Bible is written not literally but as an idea.

And you tell the kid what for!

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Maybe one day, if I get really bored.