there are no human gurus, only great poets, writers and leaders.

[GadarJeet]

The human guru is a Hindu idea. The Granth wanted to strip that idea away of a human guide and make man focus on the one within. People will never understand the truth of Sikh history and what really happened if they keep putting the pretext of "guru" in front of Nanak's name. Calling Nanak a "guru" is blasphemous when his writings discard the human guru and point to the one within the home of the self!