શરીર કટાઈ જાય, તે કરતાં કસાઈ જાય તે સારું.

śarīra kaṭāī jāya, tē karatāṁ kasāī jāya tē sāruṁ.

Literally: It is better for the body to be worn out than to rust.
What it means: Hard work and activity are better than wasting away in idleness.

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.