וְיֹתֵ֥ר מֵהֵ֖מָּה בְּנִ֣י הִזָּהֵ֑ר עֲשׂ֨וֹת סְפָרִ֤ים הַרְבֵּה֙ אֵ֣ין קֵ֔ץ וְלַ֥הַג הַרְבֵּ֖ה יְגִעַ֥ת בָּשָֽׂר׃
And furthermore, my son, be admonished: of making many books there is no end; and much study is a weariness of the flesh.
Aramaic Targum to Ecclesiastes
12. And more than these, my son, be careful to make books of wisdom without end, but occupy yourself much with words of Torah and become wise with weariness of flesh.