I think this expression can be considered a "scientific truth"; hence, it remains in the present tense.
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SnappyBenjamin Franklin said, "Time was money."
According to English grammar that I learned, the above sentence can be changed into indirect speach.
Benjamin Franklin said that time is money. ("time is money" is a proverb and not affected by the theory of sequence of tenses.)
But I found "Benjamin Franklin said that time was money," on the Inter