કાચા ઘટમાં કાંકરા, બે કદી પેસી જાય;

kācā ghaṭamāṁ kāṁkarā, bē kadī pēsī jāya;

Literally: If two pebbles ever enter an unbaked clay pot;
What it means: Bad habits or evil thoughts instilled in childhood are extremely difficult to remove later in life.

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.