'One went to the door of the Beloved and
knocked. A voice asked, 'Who is there?
He answered, 'It is I.'
The voice said, 'There is no room for Me and Thee.'
The door was shut.
After a year of solitude and deprivation he returned and knocked.
A voice from within asked, 'Who is there? '
The man said, 'It is Thee'
The door was opened for him.'
Jelaluddin Rumi
http://www.poemhunter.com/poem/rumi-poem-5/
