દુશ્મન હો ચીંટીસા, નહીં હાથીસે કમ મગર;

duśmana hō cīṁṭīsā, nahīṁ hāthīsē kama magara;

Literally: Even if the enemy is like an ant, do not consider him less than an elephant;
What it means: Warns never to underestimate any enemy, no matter how small or weak they may seem.

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.