Ecclesiastes 12:11-13

11The words of the wise are like cattle prods—painful but helpful. Their collected sayings are like a nail-studded stick with which a shepherd drives the sheep.

12But, my child, let me give you some further advice: Be careful, for writing books is endless, and much study wears you out.

13That’s the whole story. Here now is my final conclusion: Fear God and obey his commands, for this is everyone’s duty.