Who is a learned sage? He who neglects his business for his study.
A person who prefers concentrating on learning over advancing his business is a dedicated scholar.
("Who is a learned sage? Rabbi Avahu in the name of Rabbi Yochanan said: He who neglects his business for his study. It is taught: whenever they ask him a halachah from his study, he answers it." – Kohelet Rabba (Vilna edition) Parashah 7)
Translation
Expression (Hebrew)
אֵיזְהוּ תַּלְמִיד חָכָם? כָּל שֶׁהוּא מְבַטֵּל עֲסָקָיו מִפְּנֵי מִשְׁנָתוֹ
Definition (Hebrew)
מִי שֶׁמַּעֲדִיף לְהִתְרַכֵּז בִּקְרִיאָה וְלִמּוּד עַל פְּנֵי עֲשִׂיַּת עֲסָקִים הוּא כְּכָל הַנִּרְאֶה תַּלְמִיד חָכָם אוֹ אִינְטֵלֶקְטוּאָל.
("אֵיזֶהוּ תַּלְמִיד חָכָם, ר' אָבָהוּ בְּשֵׁם ר' יוֹחָנָן כָּל שֶׁהוּא מְבַטֵּל עֲסָקָיו מִפְּנֵי מִשְׁנָתוֹ, תְּנִי כָּל שֶׁשּׁוֹאֲלִין אוֹתוֹ הֲלָכָה מִמִּשְׁנָתוֹ וּמֵשִׁיב עָלֶיהָ" – קֹהֶלֶת רַבָּה (וִילְנָה) פָּרָשָׁה ז).