Because the Teacher was wise, he taught the people everything he knew. He collected proverbs and classified them.
Indeed, the Teacher taught the plain truth, and he did so in an interesting way.
A wise teacher's words spur students to action and emphasize important truths. The collected sayings of the wise are like guidance from a shepherd.
But, my child, be warned: There is no end of opinions ready to be expressed. Studying them can go on forever and become very exhausting!
References for Ecclesiastes 12:12
Here is my final conclusion: Fear God and obey his commands, for this is the duty of every person.
God will judge us for everything we do, including every secret thing, whether good or bad.