ભર્યા ચરૂમાંથી દાણે ચાંપી જોવાય.

bharyā carūmāṁthī dāṇē cāṁpī jōvāya.

Literally: From a full pot, one grain is pressed to check.
What it means: A small sample is sufficient to judge the quality of the whole.
The English proverb Shah set beside it: By a handful the whole sack may be known.A whole may be judged by a part.

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.