Be

The only person who can write about Bhagavan is the person who really knows Him, and that only person who really knows Him is Bhagavan Himself. And it is perfectly certain that Bhagavan will never write about Himself.

You say: "If there is nothing, why write?"

Yes, why? The whole thing can be summed up in four words: 

THERE IS NOTHING. BE! 

When one understands those four words, one understands everything including Bhagavan Himself.

Then, there is no more to say.

(Source: Arunachala's Ramana., Boundless Ocean of Grace, Volume 6.
Sri Ramanasramam, Tiruvannamalai.)