પડેગી જબ ખુજેગી, તબ સબ સુજેગી.

paḍēgī jaba khujēgī, taba saba sujēgī.

Literally: When it falls and scratches, then everything will be understood.
What it means: One only learns the reality of a situation when forced to face the consequences of their actions.

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.