સમુદ્રનું માપ થાય, કાઈના મનનું માપ થાય નહીં, અથવા પેટનું માપ થાય નહીં.

samudranuṁ māpa thāya, kāīnā mananuṁ māpa thāya nahīṁ, athavā pēṭanuṁ māpa thāya nahīṁ.

Literally: The ocean can be measured, but no one's mind or stomach can be measured.
What it means: It is impossible to truly know or satisfy the depths of human thoughts and desires.

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.