The phrase "salt of wisdom" refers to someone who imparts wisdom or adds wise perspective to a situation. In terms of synonyms, the phrase can be replaced with "fountain of knowledge," "sage advisor," "voice of reason," "well of experience," or "oracle." Each of these phrases conveys the same idea of someone who possesses insight and shares it with others. Other synonyms for "salt of wisdom" might include "wise counselor," "mentor," "guide," or "trusted confidante." Regardless of the words used, the message behind them is clear: wisdom is a valuable asset, and those who possess it are highly respected and sought after.