માન્યા ચોર મરે નહીં.

mānyā cōra marē nahīṁ.

Literally: A thief who is merely supposed to exist does not die.
What it means: Imaginary or unconfirmed dangers cannot be dealt with until they are confronted.

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.