ઉતાવળા સો બાવરા ધીરા સો ગંભીર.

utāvaḷā sō bāvarā dhīrā sō gaṁbhīra.

Literally: Those who are hasty are foolish, those who are calm are wise.
What it means: Impatience leads to foolish errors, whereas patience yields thoughtful and composed actions.

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.