ઠઠ નિશાળીઆને વતરણું ઘણાં.

ṭhaṭha niśāḷīānē vataraṇuṁ ghaṇāṁ.

Literally: The empty student has many excuses.
What it means: Those who know the least are often the most arrogant or full of pretense.
The English proverb Shah set beside it: He that knows least, commonly presumes most.

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.