Ecclesiastes 12:11-13

11The words of the wise are like [prodding] goads, and these collected sayings are [firmly fixed in the mind] like well-driven nails; they are given by one Shepherd.

12But beyond this my son, [about going further than the words given by one Shepherd], be warned: the writing of many books is endless [so do not believe everything you read], and excessive study and devotion to books is wearying to the body.

13When all has been heard, the end of the matter is: fear God [worship Him with awe-filled reverence, knowing that He is almighty God] and keep His commandments, for this applies to every person.