Ecclesiastes 12:11-13

11The words of the wise are like goads, and the anthologies of the masters are like firmly embedded nails driven by a single Shepherd.1 12And by these, my son, be further warned: There is no end to the making of many books, and much study wearies the body.

13When all has been heard, the conclusion of the matter is this: Fear God and keep His commandments, because this is the whole duty of man.