In his epilogue, we see that Solomon turns everything around and shows that we can find meaning in a vain world. First, Solomon gives a final word of warning that we must heed, and then he gives a final word of command that we must obey.
The Teacher's Final Word of Warning (v9-12)
Listen to the wise words of the teacher (v9-11)
Beware of the contradictory words of the foolish (v12)