These words by the 10th c. Sufi Shaikh Abul Hassan Kharaqani were not written by him; they were spoken, and preserved by those around him. For more about this influential mystic, see this earlier post.

For thirty years I have been speaking to my Lord only,
and people have thought it is them I am addressing.
I have uttered not a single insincere word,
for within and without I have only been with my Beloved.
If the Prophet (Peace be upon Him) were to walk through this door now,
He would find the same and nothing else.

Rendition by Vraje Abramian