પાન સડે, ઘોડા ઠડે, વિદ્યા વીસર જાય;

pāna saḍē, ghōḍā ṭhaḍē, vidyā vīsara jāya;

Literally: Leaves rot, horses become cold, knowledge is forgotten.
What it means: Anything that is not maintained or practiced will eventually deteriorate.
The English proverb Shah set beside it: Used koys are always bright.

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.