સુતાર વાળા દીવે.

sutāra vāḷā dīvē.

Literally: A carpenter works by a burning lamp.
What it means: A skilled artisan must focus closely and work under proper conditions to succeed.

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.