ચૌદ જાણે, તેને ચાર જાણનારા શું શિખવે.

cauda jāṇē, tēnē cāra jāṇanārā śuṁ śikhavē.

Literally: He who knows fourteen, what will the one who knows four teach him?
What it means: It is futile for an ignorant person to try to instruct an expert.

Also said as

ગુજરાતી કહેવતસંગ્રહ (Gujarati Kahevat Sangrah) (1923) ગુજરાતી કહેવતસંગ્રહ (Gujarati Kahevat Sangrah) (1921) · 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.