“This is the Kali Yuga,
Even Rakshashas (demons) will incarnate as teachers to mislead you.
Those who must be destroyed by these demons will be.
without inquiry there is no teaching.
Shun every teacher who does not teach inquiry.
Directly looking at your own face is the only teaching.
it means the ego is enlightened so stay away.
Western teachers who say this are preachers so stay away
and only write books to load more garbage on seekers,
and more money in their pockets.
They will attract so many students,
but in Kali Yuga it is the falsehood which will draw the crowds.
The Truth and the true Gurus will be neglected."
(Source)