ન જાણે જોશી તે જાણે ડોસી.

na jāṇē jōśī tē jāṇē ḍōsī.

Literally: What the astrologer does not know, the old woman knows.
What it means: Practical, long-lived experience is often superior to theoretical or professional knowledge.

Also said as

ગુજરાતી કહેવતસંગ્રહ (Gujarati Kahevat Sangrah) (1923) · read from the scan by machine — the Gujarati itself is unchecked · English is machine-made and nobody has checked it yet

Heard it differently, or know we've got the sense wrong? Tell us — that is exactly the kind of correction this needs.