લડાઈમાં ધા ને રમતમાં દાવ ચુકવો નહીં.

laḍāīmāṁ dhā nē ramatamāṁ dāva cukavō nahīṁ.

Literally: Do not miss a blow in battle, nor a turn in a game.
What it means: One must seize every opportunity and stay fully alert when engaged in a contest or conflict.

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.