ખેંચ જાણે, જાણે ખાંચ, તેને ન આવે ઊની આંચ.

khēṁca jāṇē, jāṇē khāṁca, tēnē na āvē ūnī āṁca.

Literally: He who knows the pull and knows the recess suffers no heat stroke.
What it means: One who understands all intricacies and risks of a situation will remain unharmed.

Also said as

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.