Fethullah Gulen and his beliefs?

Anyone know of Fethullah Gulen and his beliefs?

Someone mentioned to me that he is a perennialist and that this is a bad thing. (Said Nursi was also mentioned)

However online, I cannot seem to find anything on this and he seems rather mainstream.

So the questions I have is:

  1. What is perennialism?
  2. Why is this bad?
  3. What are the views of Fethullah Gulen and are they mainstream?
  4. What of Said Nursi?
  5. Is there anything else that would be interesting to know?

Thanks.

"Said Nursi"

i kept reading said, as in the english word and was wondering...said Nursi?! what the frick is a Nursi?! and have it being mentionned previously and i completely missed it?

-_-"

Is it true? Is it kind? Is it necessary?

Its a person.

Sa'id from Nurs.

The name is pronounced Sa'id or Sa'eed, but written sometimes Said.

Wikipedia page on

"For too long, we have been a passively tolerant society, saying to our citizens 'as long as you obey the law, we will leave you alone'" - David Cameron, UK Prime Minister. 13 May 2015.