Komentarz do Koheleta 12:12

And furthermore my son be admonished. More than the uprightness of the words of truth, the words written in the aforementioned books.

“More than that, my son, be careful: Making many books has no end, and much prattle is exertion of the flesh” (Ecclesiastes 12:12).
“More than that [mehema], my son, be careful” – [of] confusion [mehuma], as anyone who introduces more than [these] twenty-four books into his house introduces confusion into his house, such as the book of ben Sira and the book of ben Tigla.⁵⁶Ancient works of wisdom literature. “And much prattle is exertion of the flesh” – as they were given for prattle and were not given for exertion.⁵⁷This is in contradistinction to the twenty-four books of the Bible, whose study requires exertion.

My son be admonished. To observe the words of the Sages. Now if you ask, “If they are necessary, why were they not written down?”

Of making many books there is no end. If we would attempt to write, we would be unable to do so.⁵⁵See Rashi in Maseches Eruvin 21b. The sages did not write in the books all that one should be observing, because “there is no end,” i.e., it would be impossible to write everything in books.

And much study wears away the flesh. And if he attempts to meditate⁵⁶Rashi understands that ולהג is like ולהגות, i.e., to meditate, from the root הגה, and the lamed is not part of the root. (Sifsei Chachomim) in large amounts [of Torah study], more than the heart can grasp, that is weariness to mankind that is not attainable, but let one not say, “Since I cannot complete the work, why should I begin?” But —