If you describe something that someone has said or written as a pearl of wisdom, you mean that it sounds very wise or helpful. I tried to attract the attention of a passing waitress and waited for Josh's next pearl of wisdom. We here in Arkansas are always so grateful for all the pearls of wisdom that may fall from Mr. Greenberg's lips. Note: People usually use this expression humorously, to suggest that in fact they think the person is saying something very obvious, boring or silly.