Here's my proof...take a look at this quotation.
"Enlightenment is man's emergence from his self-imposed nonage. … This nonage is self-imposed if its cause lies not in lack of understanding but in indecision and lack of courage to use one's own mind without another's guidance." — Immanuel Kant, "What is Enlightenment?" (1784)
So the man is telling us on one hand not to listen to another for guidance, to use our own mind, but in the very same stroke he is breaking down his own integrity by giving us guidance which he knows we will undoubtedly take heed, some of us at least, many of us maybe not...
But do you see how he is somewhat mistaken in his logic? Perhaps reading the DAO would have been nice for him.