Ecclesiastes 12:12
And further, by these, my son, be admonished: of making many
books there is no end; and much study is a weariness of the flesh.
Ask yourself, how many books existed back then? Printing press came along well over a thousand years later. manuscripts were hand written. The average person did not have any books at all. So, why does it make sense that this verse is part of the Bible?
(From Strongs dictionary in Online bible)
05612 ספר cepher say’- fer or (fem.) ספרה ciphrah (#Ps 56:8) sif-raw’
from 05608; n f/n m; [BDB-706b, BDB-707b] {See TWOT on 1540 @@ "1540a" } {See TWOT on 1540 @@ "1540b" }
AV-book 138, letter 29, evidence 8, bill 4, learning 2, register 1, learned + 03045 1,
scroll 1; 184
n f
1) book
n m
2) missive, document, writing, book
2a) missive
2a1) letter (of instruction), written order, commission, request, written decree
2b) legal document, certificate of divorce, deed of purchase, indictment, sign
2c) book, scroll
2c1) book of prophecies
2c2) genealogical register
2c3) law-book
2c4) book (of poems)
2c5) book (of kings)
2c6) books of the canon, scripture
2c7) record book (of God)
2d) book-learning, writing
2d1) be able to read (after verb ‘to know’)
It's an anachronism, a bad translation, scrolls or works of literature works fine. Ecclesiastes is n illustration of how someone thinks when worldly wisdom takes over and they get depressed and cannot see the reality of what God is doing. Remember Solomon turned to the false gods of his wives when he got older.
All scripture is useful for teaching, preaching, rebuking, and training in righteousness so the man of God fully equipped for the work he is given to do. Another example of this is when Prophets continue in an exercise of futility in the Old Testament, we're supposed to learn from their mistakes and lack of fruit from that particular methodology.