He would have had more luck than wisdom.
He succeeded in his endeavors thanks to the good fortune that befell him, and not because of his precise abilities.
(Modern Hebrew following the expression "His luck is stronger than his wisdom")
Translation
Expression (Hebrew)
הָיָה לוֹ יוֹתֵר מַזָּל מִשֵּׂכֶל
Definition (Hebrew)
הִצְלִיחַ בְּמַעֲשָׂיו בִּזְכוּת הַמַּזָּל הַטּוֹב שֶׁהֵאִיר לוֹ פָּנִים וְלֹא בִּזְכוּת כִּשּׁוּרָיו דַּוְקָא.
(הָעִבְרִית הַחֲדָשָׁה בְּעִקְבוֹת הַבִּטּוּי "מַזָּלוֹ חָזָק מִשֶּׁכָּלוּ")