જોગીની ધુણી, જબ ખોલું તબ આગ.

jōgīnī dhuṇī, jaba khōluṁ taba āga.

Literally: An ascetic's fire pot: whenever I uncover it, there is fire.
What it means: A quiet or reserved person harbors intense rage that flares up whenever stirred.

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.